FitnessBrand ReviewAug 2026

Dymatize ISO 100 Reviewed: The Benchmark Isolate, Independently Assessed

ISO 100 is a default comparison point for whey isolate, which is exactly why almost nothing written about it is independent. Search the name and you get shops. So we went to the places a shop cannot edit: the US government database that catalogues its actual printed label, and the testing laboratory that publishes which products it certifies and which it does not.

25 g

Declared protein per 30 g scoop

2.6 g

Declared leucine per serving

Dymatize brands on the Informed Protein list

How we checked. Every label figure below was pulled on 5 August 2026 from the NIH Dietary Supplement Label Database, which catalogues the physical panel as printed, specifically the two current ISO100 records numbered 302415 and 302405. Every certification claim was read from the testing laboratory own published lists the same day, not from the brand and not from a retailer. Recall history came from the US FDA enforcement database through the openFDA API. Where a check came back empty or we could not retrieve something, we say so rather than filling the gap.

What ISO 100 Is

ISO 100 is a whey protein isolate powder sold by Dymatize. The brand prints it as one word, ISO100, usually followed by the word Hydrolyzed, and the range covers a long list of flavours plus a separate clear drink version called ISO100 Clear. The tub most people mean is the opaque powder in flavours like gourmet chocolate, gourmet vanilla, fudge brownie and strawberry.

Two facts about who stands behind it are printed on the pack rather than inferred. The contact block on both current label records reads manufactured for and distributed by Premier Nutrition, Emeryville, California, USA. A separate mark on the front reads Born in the USA. Those are label statements, and we did not attempt to audit the supply chain behind them.

Isolate sits above concentrate in the whey hierarchy because more of the non protein fraction has been filtered out. That trade, higher protein density against higher price, is the whole category argument and it deserves its own page rather than a paragraph here. Our whey isolate versus concentrate guide covers it. This page is about one product and whether it earns its position.

The Label, Read From a Government Database

Most reviews quote the marketing page. We used the NIH Dietary Supplement Label Database instead, which is a catalogue of supplement labels as physically printed, maintained by the Office of Dietary Supplements at the US National Institutes of Health. That distinction matters, and there is a trap in it worth naming immediately: appearing in that database means NIH has catalogued the panel, nothing more. It is not an FDA review and it is not an approval. Dietary supplements are not FDA approved in the United States. A listing is a listing.

With that said, here are the two current ISO100 records side by side. They are different formats, which is why the numbers differ, and the comparison is more useful than either alone.

Declared per serving	Strawberry, 5 lb tub	Gourmet chocolate, single packet
Serving size	30 g, one scoop	32.2 g, one packet
Protein	25 g	25 g
Protein by weight	about 83 percent	about 78 percent
Calories	110	120
Total carbohydrate	2 g	2 g
Total fat	1 g	1 g
Cholesterol	10 mg	10 mg
Sodium	75 mg	180 mg
Potassium	0 mg	230 mg
Calcium	120 mg	120 mg
Servings per container	76	1

The protein density is the headline. Twenty five grams of protein out of a thirty gram scoop is a lean ratio by any standard, and it is the number that justifies calling this an isolate rather than a blend. The single serve packet is a little less dense on the same protein figure because it carries ingredients the tub does not: the chocolate packet ingredient list adds cocoa powder, salt and potassium chloride, which is also why its sodium and potassium lines are higher. If you buy packets and assume the tub arithmetic, you will be slightly off.

The full ingredient list on the strawberry tub record is short, which is what you want from an isolate: hydrolyzed whey protein isolate, whey protein isolate, natural and artificial flavours, sucralose, soy lecithin, steviol glycosides. Two sweeteners, one emulsifier, one flavour system, two protein ingredients. Nothing in that list is a free amino acid, which is the ingredient pattern people look for when they worry about a label being padded.

The amino acid panel, with the footnote attached

The tub prints a typical amino acid profile: 25 g of total amino acids per serving, of which 47 percent or 11.9 g are essential amino acids and 53 percent or 13.4 g are non essential. Inside the essential fraction it declares 5.5 g of BCAAs in a 2:1:1 ratio, made of 2.6 g leucine, 1.4 g isoleucine and 1.4 g valine. It also declares 4.4 g of glutamine.

That last figure carries a footnote on the pack which most write ups drop: includes glutamic acid. So 4.4 g is glutamine plus glutamic acid together, not free glutamine. The word typical also matters. It is a representative profile for the protein, not a batch measurement of the tub in your hand.

What Hydrolyzed Means Here, and What It Does Not

The word Hydrolyzed sits on the front of the pack in the product name, and it is the single most misread thing about this product. Hydrolysis means the protein has been partly broken down into shorter chains before it reaches you, which the pack describes as broken down into smaller protein molecules.

Here is what the ingredient list actually shows. Two protein ingredients are declared, in this order: hydrolyzed whey protein isolate first, then whey protein isolate. Ingredients are listed by descending weight, so the hydrolysed fraction is the larger of the two, but plain non hydrolysed isolate is unambiguously in there as well. The printed claim is that 100 percent of the protein comes from whey protein isolate. That is a different sentence from 100 percent of the protein is hydrolysed, and only the first one is on the label. The split between the two is not disclosed.

Then the harder question: does hydrolysis buy you anything measurable? The trial usually cited for this is a 2014 study in the Scandinavian Journal of Medicine and Science in Sports, from a group at Aarhus University in Denmark. Twenty two subjects were split across two groups for twelve weeks of knee extensor training, so roughly eleven people per group. The group taking high leucine whey protein hydrolysate with carbohydrate gained more quadriceps cross sectional area than the other group, 7.3 percent against 3.4 percent, and more patellar tendon area.

Read the comparison group before you read the result. The other arm in that trial received carbohydrate alone. There was no ordinary whey arm. So the finding is that hydrolysate beat a carbohydrate placebo, which is the expected result for any decent protein. It says nothing about whether hydrolysed isolate beats plain isolate, because that comparison was never run in this study. If someone quotes those percentages at you as proof that hydrolysed whey is superior to regular whey, they have skipped the control group.

Does 25 g With 2.6 g of Leucine Actually Do Anything

Separate from the brand, there is a fair question about whether a scoop of anything moves the needle. The largest synthesis on that point is a 2018 systematic review and meta analysis in the British Journal of Sports Medicine covering 49 studies and 1,863 participants across all arms, restricted to healthy adults doing at least six weeks of resistance training. Protein supplementation increased one repetition maximum strength by 2.49 kg, with a 95 percent confidence interval of 0.64 to 4.33 kg, and fat free mass by 0.30 kg, interval 0.09 to 0.52 kg.

Those are real but modest effects, and the population qualifiers are part of the result rather than footnotes to it. The benefit shrank with increasing age and was larger in people who were already resistance trained. The analysis also found that once total protein intake passed about 1.62 g per kg of body weight per day, extra supplementation produced no further gains in fat free mass. In other words the scoop is doing arithmetic on your daily total, not adding a separate effect. One of the authors declares grant support, travel expenses and honoraria from the US National Dairy Council, an agency that had supported trials included in the analysis.

Against that, ISO 100 label figures land inside the ranges the International Society of Sports Nutrition position stand on protein and exercise describes for healthy exercising individuals. That stand describes a per serving figure of roughly 0.25 g per kg of body weight or an absolute 20 to 40 g, and acute doses containing 700 to 3,000 mg of leucine alongside a balanced spread of essential amino acids. Twenty five grams of protein and 2,600 mg of leucine sit inside both windows. That is a position stand rather than a single trial, and several of its authors hold industry affiliations.

None of that is a recommendation to take anything. It is the honest ceiling on what a protein powder does: it helps you reach a daily protein total, and beyond that total the evidence stops showing extra return.

What the Third Party Mark Covers, and What It Skips

The ISO 100 pack carries an Informed Choice seal with the words We Test You Trust, plus a printed line reading banned substance tested. LGC, the UK laboratory group behind the Informed marks, publishes separate lists for separate programmes, and those programmes answer different questions. We pulled three of them on 5 August 2026 and looked for Dymatize in each.

Informed Choice: ISO 100 is on the list

On the certified products list dated August 2026, ISO100 Hydrolyzed Protein Powder (USA) appears as one of six items under the Dymatize Nutrition heading, alongside Super Mass Gainer, Energyze Pre-Workout, Elite Casein, Performance Protein Shake and Elite 100% Whey Protein. A separate Dymatize Nutrition (Europe) heading carries seven items including ISO100 Hydrolyzed (Europe). LGC describes the programme as analysing for over 285 banned substances using ISO/IEC 17025 accredited methods, and says that after certification it keeps buying retail samples at least monthly for blind testing. On the same page LGC states its own limit plainly: no laboratory analysis will encompass every analyte on the WADA prohibited list. That caveat travels with the reassurance.

Informed Sport: the protein is not on it

Informed Sport is the stricter tier, aimed at drug tested athletes, where batches are tested before release. Dymatize does appear on that list, but only under a Dymatize Nutrition (Europe) heading and only with two items, BCAAs (Europe) and Glutamine Micronized (Europe). ISO 100 is not among them. The list is populated and current, with other brands such as Optimum Nutrition and Science In Sport present, so this is a real absence rather than a page that failed to load.

Informed Protein: Dymatize is not listed at all

This is the programme that answers the label accuracy question. LGC describes Informed Protein as verifying that protein label claims are backed by independent testing, with certified products regularly tested for protein content, free amino acids and a range of known adulterants. Its certified brands page lists more than thirty companies. Dymatize is not one of them. The page also notes that not all companies have their entire protein range certified, so brand level presence would not have settled it either.

Put plainly: the mark on an ISO 100 tub is evidence about banned substance contamination, and it is meaningful evidence. It is not evidence that there are 25 g of protein in the scoop. The programme that checks that number does not list this brand, so the protein figure rests on the manufacturer own testing. And Informed Choice is a private certification a company pays to enter, not a government approval of any kind. One more detail worth carrying: ISO100 Clear, the clear drink version, did not appear on the August 2026 certified products list, so do not assume the seal covers every product wearing the ISO100 name.

What Nobody Has Tested

Here is the uncomfortable part of any brand review. We could find no published independent assay of ISO 100 specifically. What exists is category level research, and it is worth knowing precisely because none of it names this product, in either direction. Each study below is described with the country and population it actually covers, because that is where most write ups go wrong.

Label protein versus measured protein, 11 products, Colombia

A 2022 study in the Journal of the International Society of Sports Nutrition sampled eleven popular whey protein supplements made and sold on the Colombian market and analysed them. Labelled protein averaged 81.4 g per 100 g against 65.7 g measured, labelled carbohydrate 3.5 g against 21.9 g measured, and labelled calories 349.8 against 368.2 measured, all statistically significant. Those are Colombian market products, not global ones, and ISO 100 was not among them. What it establishes is that the gap between label and tub is a real phenomenon somewhere, not that it applies here.

Label compliance, isolate and concentrate, European market

A 2023 paper in Foods, from toxicology groups in the Canary Islands, measured protein by the Kjeldahl method plus eighteen elements by ICP-OES in isolate and concentrate whey supplements described as representative of the European market. Mean protein content came out at 70.9 percent with a range from 18 to 92.3 percent, and the authors reported statistically significant differences between declared and real protein percentages and a high degree of non compliance with labelling claims. Again European products, and again no product named.

Heavy metals and microplastics, 30 products, China

A 2026 study in Environmental Research measured arsenic, cadmium, lead and mercury in thirty sports protein supplements bought commercially in China. Every sample contained at least one target metal. For a whey buyer the split is the part that matters: plant derived products carried higher mean lead at 0.18 mg per kg and cadmium at 0.05 mg per kg than dairy derived products at 0.06 and 0.01 respectively. Microplastic particles were found in all samples at 2 to 19 particles per 30 g serving. The modelled hazard index was 0.45 at 30 g per day and 0.90 at 90 g per day, with a Monte Carlo 95th percentile of 1.28 under high use. Chinese market, thirty products, none named.

Why banned substance testing exists at all, 634 products, 13 countries

The reason a seal is worth anything traces to work by the doping analysis group at the German Sport University Cologne. Their 2008 review in the Journal of Mass Spectrometry describes an international study run in 2001 and 2002 on 634 nutritional supplements bought in thirteen different countries, in which about 15 percent of the non hormonal supplements were contaminated with anabolic androgenic steroids, mainly prohormones, none declared on the label. Note the qualifier non hormonal: that 15 percent is the rate among products that had no business containing hormones. A 2005 review in the Journal of Sports Science makes the consequence explicit, that strict liability in sport means innocent ingestion is not an acceptable excuse.

We also queried the US FDA food enforcement database through the openFDA API. A full text search for Dymatize returns five records in total, all classified Class I, all with status terminated, and every one of them an undeclared allergen problem rather than a contamination or potency problem. Three are the same recovery drink powder in three flavours, recalled by Dymatize Enterprises in May 2012 because the label declared whey but did not declare milk. The other two are protein bars recalled in January 2013 by the contract manufacturer Belmont Confections after a consumer allergic to peanuts reported a reaction. Filtering the product description field for ISO100 and for ISO 100 separately returned no matches at all, and none of the five descriptions names ISO 100. That is a clean record for this product in that database, with two limits stated: it covers US enforcement reports only, and a terminated recall from 2012 on a different product line tells you little about a tub bought in Vietnam in 2026.

The Lactose Question, Which Matters More in Vietnam

For a reader in Vietnam this is often the deciding factor rather than a footnote, and the evidence base is thinner than the confident advice you will find in gym forums. The oldest direct data point we could find is a 1977 study in the American Journal of Clinical Nutrition. It tested 31 adult Vietnamese subjects, who were living in the United States at the time, with oral lactose tolerance tests. All 31 had flat curves indicating lactose malabsorption, and 20 of them had symptoms during or after the test.

Treat that carefully rather than as a headline. Thirty one people is a small sample, 1977 is a long time ago, the subjects were tested abroad, and malabsorption on a test is not the same thing as intolerance in daily life, which is exactly why the paper reports the two numbers separately. What it fairly supports is that dairy sugar is more likely to be a live issue here than in a European or North American readership, which is why the isolate versus concentrate distinction gets more attention in this market.

What the ISO 100 label says on the point is narrower than the marketing implies. The pack states the protein is filtered to remove excess carbohydrate, cholesterol, fat, sugar and lactose. The word is excess, not all, and there is no lactose free claim anywhere on the panel. The allergen line reads contains milk and soy. The hard number that constrains it is the carbohydrate line: 2 g of total carbohydrate per 30 g scoop puts a ceiling on how much lactose can possibly be in there, since lactose is a carbohydrate.

Where this stops being a label question: if dairy reliably makes you unwell, that is a conversation with a doctor or a pharmacist who can tell malabsorption apart from a milk protein allergy and from unrelated gut problems. A carbohydrate line on a tub cannot do that, and neither can a review page.

Checking a Real Tub in Vietnam

A globally recognised SKU sold at a premium is exactly the profile counterfeiters go after, and in Vietnam ISO 100 reaches buyers through gym counters, marketplace listings and grey imports as well as through formal importers. The seller is the party with the incentive, so seller assurances are the weakest evidence available. Three checks route around them entirely.

1Compare the panel against the NIH record. This is the check almost nobody knows exists. The Dietary Supplement Label Database holds the ISO100 label as printed, including the nutrition figures, the ingredient order and the allergen line. Pull up record 302415 for the 5 lb tub and read it against the pack in your hand. A panel that disagrees on protein per scoop, on serving size, or on ingredient order is a panel worth questioning.
2Search the batch number with the laboratory, not the shop. LGC tells users of its programmes to take the batch number printed on the product and search it on the LGC website. That search is run by the testing laboratory, so it works the same whether the tub came from a Ho Chi Minh City gym counter or a marketplace listing. A tub carrying the Informed Choice mark whose batch does not resolve is the first thing to raise with the retailer.
3Look for the Vietnamese secondary label. Per the USDA Foreign Agricultural Service country report on Vietnam, food imported for consumption and circulation in the Vietnamese market must be labelled either in Vietnamese with the full mandatory content, or with a secondary label carrying the Vietnamese translation of the mandatory information from the original. The same report describes health supplements as requiring a product declaration submitted to the Vietnam Food Administration or a provincial authority, which then issues a certificate. A tub with no Vietnamese sticker and no named importer has not gone through that route.

Two honest limits on that third check. Vietnamese food safety decrees are revised periodically, so confirm the current requirement with the Vietnam Food Administration rather than treating a description written in 2024 as today rule. And a Vietnamese sticker proves an import route was followed, not that the powder inside is genuine. Stickers are the easiest part of a pack to reproduce.

What we will not tell you: we could not verify any published hologram specification, seal design or lot code format for this brand, so we are not going to describe one. Guides that list those details without a source are usually inventing them, and a fake authentication test is worse than none, because it hands you confident wrong answers in both directions. We also did not verify Vietnamese retail pricing or which sellers are authorised importers, so we make no claim about either.

The general principle is the same one we apply to every certificate: a document supplied by the person selling you the product is not independent evidence. Our guide to verifying a certificate of analysis and our comparison of independent testing labs work through the same logic in a different product category.

Is the Premium Justified

ISO 100 sells at a premium and carries a name most buyers recognise before they read the panel. Whether that is worth paying depends entirely on which of the following you are actually buying, so here is the fit rather than a recommendation.

If this is you	What the checks above point to
You want maximum protein per calorie	This is where the product delivers. Twenty five grams from a thirty gram scoop, with 2 g of carbohydrate and 1 g of fat, is about as lean as a flavoured powder gets. That ratio is the product.
You are worried about contaminated supplements	The Informed Choice listing is real, current as of the August 2026 list, and backed by a named accredited laboratory with monthly retail sampling. That is meaningfully better than an unmarked tub, within the limit LGC itself states about full WADA coverage.
You are subject to formal doping control	Informed Choice is retail sampling, not batch by batch release testing. The batch by batch tier is Informed Sport, and ISO 100 was not on that list in August 2026. If your federation expects every batch tested, this is the gap to raise with them.
You want the protein number independently verified	You do not get that here. Dymatize was not on the Informed Protein certified brands page, so the 25 g rests on the manufacturer own testing. No published independent assay of ISO 100 turned up in our search.
You are paying for the word Hydrolyzed	That is the weakest part of the value case. The ingredient list shows hydrolysed isolate plus plain isolate with no disclosed split, and the trial usually cited compared hydrolysate against carbohydrate rather than against ordinary whey.
You just need to hit a daily protein target cheaply	The meta analysis evidence is about total daily protein, with no further gain in fat free mass past roughly 1.62 g per kg per day. A cheaper protein that gets you to the same total does the same arithmetic.
You have kidney disease, are pregnant, or are managing a diagnosis	Protein intake stops being a fitness question and becomes a clinical one. That belongs with a doctor or a registered dietitian, not a review page.

For how this brand compares against the rest of the shelf rather than against itself, our Rule 1 protein review runs the same checks on a competitor and reaches a different verdict on the testing question, and the protein shake guide covers whey against casein against plant across the whole category.

The Short Version

The protein density holds up. The NIH label record declares 25 g of protein in a 30 g scoop, about 83 percent by weight, with 2 g of carbohydrate and 1 g of fat.
Hydrolyzed is a product name, not a formula. The ingredient list shows hydrolysed whey isolate first and plain whey isolate second, with no disclosed split. The printed claim is that all the protein comes from isolate, which is a different sentence.
Banned substance testing is real and current. ISO100 Hydrolyzed sits on the LGC Informed Choice list dated August 2026, tested for over 285 substances, with retail sampling at least monthly. LGC also says no analysis covers every WADA analyte.
Nobody independently verifies the protein number. That is the Informed Protein programme, and Dymatize was not on its certified brands page in August 2026.
It is not on the Informed Sport list. Only two Dymatize Europe items are, and neither is ISO 100. That matters if you are drug tested and not otherwise.
No independent assay of this product turned up. The category research we found covers Colombian, European and Chinese market products and names none of them.
The US FDA enforcement database is clean for this product. Five Dymatize records exist, all 2012 to 2013, all undeclared allergens, all terminated, none of them ISO 100.
It is not sold as lactose free. The pack says excess lactose is filtered out, not all of it, and declares 2 g of carbohydrate per scoop.
Check the panel against NIH record 302415 and the batch number with LGC, not with the seller. We found no published hologram or lot code spec and will not invent one.

Frequently Asked Questions

Is Dymatize ISO 100 actually 100 percent whey isolate?+

The label claim is narrower than the name suggests, and the two are not the same statement. The panel we read in the NIH Dietary Supplement Label Database lists two protein ingredients in order: hydrolyzed whey protein isolate first, then plain whey protein isolate. The printed claim is that 100 percent of the protein comes from whey protein isolate, which is true of both of those. It is not a claim that 100 percent of the protein is hydrolyzed. The label does not disclose the split between the two.

How much protein is in one scoop of ISO 100?+

The 5 lb strawberry record in the NIH database declares 25 g of protein in a 30 g scoop, which is about 83 percent protein by weight, alongside 110 calories, 2 g of carbohydrate, 1 g of fat and 75 mg of sodium. The single serve chocolate packet declares the same 25 g of protein but in a 32.2 g serving, which works out at about 78 percent, with 120 calories and 180 mg of sodium. Those are label declarations catalogued by NIH, not assay results.

Is ISO 100 third party tested for banned substances?+

Yes, through Informed Choice. On the LGC Informed Choice certified products list dated August 2026, ISO100 Hydrolyzed Protein Powder (USA) is one of six items under the Dymatize Nutrition heading, and ISO100 Hydrolyzed (Europe) is one of seven under the Europe heading. LGC says certified products are analysed for over 285 banned substances using ISO/IEC 17025 accredited methods, with retail samples bought at least monthly for blind testing after certification. LGC also states on the same page that no laboratory analysis will encompass every analyte on the WADA prohibited list, and both halves of that matter.

Does the Informed Choice mark prove there are really 25 g of protein in the scoop?+

No. Informed Choice is a banned substance programme. LGC runs a separate programme, Informed Protein, that verifies protein label claims and screens for amino acid spiking, and on 5 August 2026 Dymatize was not among the brands listed on its certified brands page. So the number on an ISO 100 tub rests on the manufacturer own testing, not on the third party mark printed next to it.

Is ISO 100 suitable if you are lactose intolerant?+

The label does not claim to be lactose free. It says the protein is filtered to remove excess carbohydrate, cholesterol, fat, sugar and lactose, and the word excess is doing real work there. What the panel does declare is 2 g of total carbohydrate per 30 g scoop, which caps how much lactose can be present, and an allergen line reading contains milk and soy. Whether that is low enough is individual. Anyone who reacts badly to dairy should raise it with a doctor or pharmacist rather than reason it out from a label.

Sources & References

Peer reviewed literature, with the country and population each study actually covers stated in the text above. None of these studies tested ISO 100.

A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults · Morton RW, Murphy KT, McKellar SR, et al. · British Journal of Sports Medicine (2018) PMID:28698222
International Society of Sports Nutrition Position Stand: protein and exercise · Jager R, Kerksick CM, Campbell BI, et al. · Journal of the International Society of Sports Nutrition (2017) PMID:28642676
Whey protein hydrolysate augments tendon and muscle hypertrophy independent of resistance exercise contraction mode · Farup J, Rahbek SK, Vendelbo MH, et al. · Scandinavian Journal of Medicine & Science in Sports (2014) PMID:23647357
Measured versus label declared macronutrient and calorie content in Colombian commercially available whey proteins · Zapata-Muriel A, Echeverry P, Van Dusseldorp TA, et al. · Journal of the International Society of Sports Nutrition (2022) PMID:35813847
Proteins and Minerals in Whey Protein Supplements · Gonzalez-Weller D, Paz-Montelongo S, Bethencourt-Barbuzano E, et al. · Foods (2023) PMID:37297488
Heavy metal and microplastic exposure from sports protein supplements: integrated health risk modeling and scenario analysis · Chen M, Dong R, Lai W. · Environmental Research (2026) PMID:41655677
Nutritional supplements cross-contaminated and faked with doping substances · Geyer H, Parr MK, Koehler K, et al. · Journal of Mass Spectrometry (2008) PMID:18563865
Contamination of dietary supplements and positive drug tests in sport · Maughan RJ. · Journal of Sports Sciences (2005) PMID:16195040
Lactose malabsorption in adult Vietnamese · Anh NT, Thuc TK, Welsh JD. · American Journal of Clinical Nutrition (1977) PMID:851072

Label, certification and regulatory sources, all read on 5 August 2026: