Consumer Reports tested Dymatize Super Mass Gainer — not ISO 100. Two different products.
Dymatize ISO 100 Review: Was It Ever Actually Tested for Lead? (2026)
✅ Direct Answer: Was Dymatize ISO 100 Tested for Lead?
No. Consumer Reports never tested Dymatize ISO 100. They tested the Dymatize Super Mass Gainer — a completely different product.
- What CR tested: Dymatize Super Mass Gainer (Gourmet Vanilla, 333 g serving) — 25% of CR’s level of concern for lead. Cleared for up to 4 servings/day. Second-cleanest result in the entire study.
- What CR did NOT test: ISO 100 (hydrolyzed whey isolate, ~110 cal/serving). It appears in neither the October 2025 round of 23 products nor the January 2026 round of 5 powders.
- What ISO 100 does have: a Clean Label Project Purity Award — genuine independent certification screening for heavy metals. But Clean Label Project issues a pass/fail certification, not a published per-serving lead figure.
- Our rating for ISO 100: ✅ Cleared on certification — not verified by a published test result. That distinction is the whole point of this page.
📌 Correction (July 2026)
An earlier version of this page, and several others on this site, listed “Dymatize ISO 100” as Consumer Reports #2. That was wrong. The product CR ranked #2 is the Super Mass Gainer. We had transferred a result between two products from the same brand — which is precisely the error this site exists to call out.
We’ve corrected it everywhere. It’s the same mistake as assuming Premier Protein’s powder result applies to their RTD shakes. It doesn’t, and this didn’t either.
Why This Distinction Actually Matters
If you search “Dymatize ISO 100 lead,” you will find plenty of pages telling you it ranked #2 in Consumer Reports testing. It didn’t. It wasn’t in the study.
Here is how different the two products are:
| ISO 100 (not CR-tested) | Super Mass Gainer (CR-tested) | |
|---|---|---|
| Protein source | Hydrolyzed whey isolate | Whey/casein blend + maltodextrin |
| Serving size | ~31 g (1 scoop) | 333 g (2.5 scoops) |
| Calories | ~110 | ~1,280 |
| Protein | ~25 g | ~52 g |
| Lead evidence | Clean Label Project certification (no published figure) | 25% of CR’s level of concern (published) |
⚠️ Serving size is why you can’t transfer the result
Lead figures are reported per serving. The Super Mass Gainer’s serving is 333 g. ISO 100’s is about 31 g — roughly a tenth the mass. Even if the two powders had identical lead concentration, their per-serving figures would differ by an order of magnitude. Different formula, different ingredients, different serving. The number simply does not carry over.
What Consumer Reports Actually Found for Dymatize
📊 The Dymatize product CR tested
Product: Dymatize Super Mass Gainer, Gourmet Vanilla
Serving size: 333 g (2.5 scoops)
Lead: 25% of Consumer Reports’ level of concern
CR guidance: “Better Choices for Daily Consumption” — up to 4 servings/day
Where it ranks: second-cleanest of everything CR tested. Only MuscleTech 100% Mass Gainer did better.
This result belongs to the Super Mass Gainer. It is not a result for ISO 100.
That is a genuinely excellent outcome. Only one product out of the 23 CR tested had lead not detected — MuscleTech 100% Mass Gainer. Everything else, including every “safe” product, carries a measured lead level. Dymatize’s 25% is the best of the rest.
| Rank | Product | Lead (% of CR’s level of concern) | CR daily limit |
|---|---|---|---|
| #1 | MuscleTech 100% Mass Gainer | Not detected — the only one | No limit |
| #2 | Dymatize Super Mass Gainer | 25% | 4 servings/day |
| #3 | Momentous Whey Isolate | 30% | 3⅓ servings/day |
| #4 | BSN Syntha-6 | 46% | 2 servings/day |
| #5 | Optimum Nutrition Gold Standard 100% Whey | 56% | 1¾ servings/day |
| #12 | Orgain Organic Plant | 143% | 4¾ servings/week |
| #23 | Naked Nutrition Vegan Mass Gainer | 1,572% — ~7.7 µg | Avoid |
Consumer Reports reports % of CR’s level of concern (0.5 µg lead/day). CR states explicitly that “no Prop 65 judgments can be made from CR’s findings.”
So What Does ISO 100’s Certification Actually Tell You?
ISO 100 holds a Clean Label Project Purity Award. That is real, and it is independent. But it’s worth being precise about what it does and doesn’t give you.
💡 A certification is a pass/fail. A test result is a number.
Clean Label Project screens products for 400+ contaminants — heavy metals, pesticides, plasticizers, mycotoxins — and awards certification to products that clear their thresholds. Fewer than 30% of protein products tested earn it. Passing is meaningful.
What it does not do is publish a per-serving lead figure the way Consumer Reports does. So you can say “ISO 100 passed an independent heavy-metals screen.” You cannot say “ISO 100 contains X µg of lead,” because nobody has published that number.
What we can say honestly about ISO 100
- It passed an independent heavy-metals screen. That's real evidence, and most products don't have it.
- Its base is inherently low-risk. Lead in protein powder comes overwhelmingly from soil uptake in plants. Whey isolate is dairy-derived and ultra-filtered. Consumer Reports found every one of the top-7 cleanest products was whey-based; the bottom of the table is dominated by plant proteins.
- The manufacturer has a proven result. Dymatize produced the second-cleanest product in CR's entire study. That says something real about their quality control.
- But there is no published lead figure for ISO 100 itself. We are not going to invent one, and we are not going to borrow the Super Mass Gainer's.
✅ Our verdict
Cleared — on certification, not on a published test result. If you want a whey protein with an actual published lead number from an independent test, Optimum Nutrition Gold Standard (CR #5, 56% of CR’s level of concern) has one — and costs less. If you want ISO 100 specifically for the hydrolyzed isolate, you're not taking a meaningful risk. Just know what you're relying on.
ISO 100 or Super Mass Gainer? Pick by Goal, Not by Safety
Both are Dymatize. Both are fine on heavy metals as far as the evidence goes. They are not interchangeable products, and the choice has nothing to do with lead:
✅ ISO 100 — for cutting, lean protein, post-workout
~25 g protein at ~110 calories. Hydrolyzed isolate, fast absorption, minimal carbs and fat. ~$1.25/serving.
Evidence: Clean Label Project Purity Award. No published lead figure. CPL rating: Cleared (certification).
✅ Super Mass Gainer — for bulking, hardgainers
~52 g protein at ~1,280 calories per 333 g serving. This is a calorie product, not a protein product. ~$3.00/serving.
Evidence: Consumer Reports — 25% of CR’s level of concern, 4 servings/day. CPL rating: Verified (published test result).
⚠️ Other Dymatize products (Elite Whey, Elite Casein)
Not independently tested and not Clean Label certified as far as we can find. Same manufacturer, but we don’t transfer results between products — that’s the whole point of this page.
CPL rating: Unverified. No data either way.
⚠️ Don't buy Super Mass Gainer as a protein powder
Its CR result is excellent, but at ~1,280 calories a serving, this is a mass gainer. If you're not deliberately trying to gain weight, the clean lead result is not a reason to drink it. Most of those calories are maltodextrin.
⚡ Quick Check: Is YOUR Protein Safe?
Tell us what you're using — we'll show you the safety data in 5 seconds:
How Dymatize Compares on Actual Evidence
| Product | Lead evidence | Source | $/serving |
|---|---|---|---|
| MuscleTech 100% Mass Gainer | Lead not detected | Consumer Reports #1 — the only one | $1.20 |
| Dymatize Super Mass Gainer | 25% of CR’s level of concern | Consumer Reports #2 | $3.00 |
| Optimum Nutrition Gold Standard | 56% of CR’s level of concern | Consumer Reports #5 | $0.75 |
| Dymatize ISO 100 | No published figure | Clean Label Project certification only | $1.25 |
| Naked Nutrition Vegan Mass Gainer | 1,572% (~7.7 µg) | Consumer Reports #23 — AVOID | $2.50 |
| Huel Black Edition | 1,288% (~6.3 µg) | Consumer Reports #22 — AVOID | $3.00 |
💰 The honest value call
If verified lead safety is what you're buying, Optimum Nutrition Gold Standard gives you a published Consumer Reports figure at $0.75/serving — 40% cheaper than ISO 100, with better evidence. ISO 100's premium buys you a 99% hydrolyzed isolate and faster absorption. Those are real benefits. They just aren't heavy-metal benefits.
Currently Using Naked Nutrition or Huel?
Switch. Naked Nutrition Vegan Mass Gainer measured 1,572% of CR’s level of concern (~7.7 µg lead). Huel Black Edition measured 1,288% (~6.3 µg). Consumer Reports advised avoiding both entirely — zero servings per week.
- Want a mass gainer with a verified result? MuscleTech 100% Mass Gainer (lead not detected) or Dymatize Super Mass Gainer (25%).
- Want everyday whey with a published number? ON Gold Standard — CR #5, 56%, $0.75/serving.
- Want a lean isolate and comfortable with certification-only evidence? ISO 100.
Where to Buy
Frequently Asked Questions
Did Consumer Reports test Dymatize ISO 100?
No. ISO 100 appears in neither CR round — not the October 2025 study of 23 products, not the January 2026 study of 5 powders. The Dymatize product CR tested was the Super Mass Gainer. Any page telling you ISO 100 “ranked #2 in Consumer Reports” is transferring a result between products. We used to be one of them. We fixed it.
Does Dymatize ISO 100 have lead?
Nobody has published a figure, so we don’t know — and neither does anyone else. ISO 100 holds a Clean Label Project Purity Award, meaning it passed an independent heavy-metals screen. But Clean Label Project issues a certification, not a per-serving lead number. Passing the screen is real evidence. It is not the same as a published test result.
Is ISO 100 safe?
The evidence is positive, but indirect. It passed an independent heavy-metals screen, its whey isolate base is inherently low-risk (lead comes mostly from plant soil uptake), and its manufacturer produced the second-cleanest product CR tested. What it lacks is a published number. We rate it cleared on certification, and we think you should know that’s what you’re relying on.
ISO 100 vs Optimum Nutrition Gold Standard?
ON has better evidence and a lower price. Consumer Reports directly measured ON Gold Standard at 56% of its level of concern and cleared it for daily use — that's a published figure from an independent test, at $0.75/serving. ISO 100 has certification but no published number, at $1.25. ISO 100's edge is purity and absorption speed, not verified safety.
Why does the serving size matter so much?
Lead figures are reported per serving, and Super Mass Gainer's serving is 333 g versus ISO 100's ~31 g. Even with identical lead concentration, the per-serving numbers would differ roughly tenfold. That's before you account for the different ingredients. This is exactly why a result from one product can't be applied to another.
Should I switch from Naked Nutrition or Huel?
Yes. Naked Nutrition Vegan Mass Gainer: 1,572% of CR's level of concern (~7.7 µg). Huel Black Edition: 1,288% (~6.3 µg). CR advised avoiding both entirely. Anything in the Dymatize line is dramatically better, and MuscleTech 100% Mass Gainer is the only product CR found with lead not detected.
The Bottom Line
🔎 Find Your Safe Protein
60-second quiz — personalized to your goals, budget, and dietary needs.
Find Your Safe Protein →Sources:
- Consumer Reports, “Protein Powders and Shakes Contain High Levels of Lead,” October 14, 2025 — 23 products. Dymatize Super Mass Gainer (Gourmet Vanilla): 25% of CR’s level of concern, 4 servings/day. Dymatize ISO 100 was not among the products tested.
- Consumer Reports, “Readers Asked Us to Test These 5 Protein Powders,” January 8, 2026 — 5 chocolate powders, no premade shakes. Dymatize ISO 100 was not among them.
- Clean Label Project, Purity Award — Dymatize ISO 100 Hydrolyzed Whey Protein Isolate. Certification screens 400+ contaminants; it does not publish per-serving heavy-metal figures.
- Note on framing: Consumer Reports reports % of CR’s level of concern (0.5 µg lead/day) and states explicitly that “no Prop 65 judgments can be made from CR’s findings.”
Last Updated: July 2026
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