Products · Protein powders & shakes · Transparent Labs
Transparent Labs Grass-Fed Whey Protein Isolate (Unflavored)
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An unflavored whey isolate listed by NSF, with lot-by-lot heavy-metal reports posted by the maker (lead 0.23 µg a scoop in the one we read). The reports are the maker’s own, and the grass-fed claim has no certifier.
Best for People who want an isolate with no sweeteners and a lot number they can look up to see what was in the batch.
- Our quality rating
- Good (4 of 5)
- Price range
- Mid-range
- Verified marks
- NSF Certified for Sport (unflavored), Informed Choice (named on its October 2026 list)
- Size
- 4 lb unflavored (55 servings of 33.3 g); the 2 lb (30 servings) is $64.99 and was out of stock in unflavored
- Made in
- Grass-fed American dairy cattle, according to Transparent Labs
approx. $110 for 4 lb (55 servings)
See it on Transparent Labs’s site →We are not affiliated with Transparent Labs. This link goes to the maker’s own page, with no tracking code. How we're funded.
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Your review
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How we evaluated it
Why we chose it What put it on our list
- NSF’s Certified for Sport database lists the unflavored powder (id 1756600; 999 g and 1,831.5 g packs; four lots: 25082050, 26071522, 26081255 and 24102973). Informed Choice’s list also names “Whey Protein Isolate.”
- Transparent Labs’ third-party tests page posts a certificate of analysis by lot. The unflavored report we opened (lot 26081254, received Aug. 25, 2026) shows per 33.3 g serving: lead 0.23 µg, cadmium 0.03 µg, total arsenic 0.17 µg and mercury under 0.03 µg, by ICP-MS at Advanced Laboratories.
- The 4 lb label has two ingredients, grass-fed whey protein isolate (33.2 g) and sunflower lecithin (100 mg), with 28 g of protein, 0 g of added sugar and 130 calories per scoop.
- Consumer Reports said that, of the brands it tested, only Momentous and Transparent Labs told it they publish results on their websites.
- The 4 lb unflavored is $109.99, about $2.00 a serving or 7 cents per gram of protein, among the lowest per gram of protein on our list.
Trade-offs What to weigh before you buy
- The reports are ordered by Transparent Labs, not by an outside body, and the one we read is stamped “Preliminary Results” and labeled for the 30-serving pack, not the 4 lb tub. The NSF listing adds an outside check, but NSF’s lead limit, 10 µg a day as Consumer Reports describes it, is far looser than CR’s 0.5 µg.
- Consumer Reports tested the brand’s Mass Gainer (0.43 µg of lead a serving) but not this isolate, so we found no independent figure for it.
- “Sourced exclusively from grass-fed American dairy cattle” is the maker’s wording. No certifier or farm is named.
- The 2 lb unflavored was out of stock when we looked, and flavored versions carry other ingredients we did not review.
- Two 2025 Prop 65 lead notices named other Transparent Labs products (Hydrate electrolytes, one of them settled, and Prebiotic Greens). We found none for the whey.
What to know Details worth knowing first
Transparent Labs’ unflavored isolate is two ingredients: grass-fed whey protein isolate and a pinch of sunflower lecithin. Isolate has less lactose than concentrate, which can matter if milk sugar bothers you; our whey protein guide covers the difference and what whey does.
Two things put it on this list. NSF’s Certified for Sport database lists the unflavored powder with four lots. And the company posts certificates of analysis by lot number, which is rare. We opened one, for an August 2026 lot, and it shows lead at 0.23 µg a scoop. Consumer Reports’ level of concern for lead is 0.5 µg a day, so that lot sits under it.
The limits are worth knowing. The reports are the maker’s own, and the one we read is marked preliminary. NSF’s mark is an outside check, but its lead limit is much looser than Consumer Reports’. We found no lead figure for this exact isolate from an independent body. If you buy it, match your lot number against the posted reports. For how the seals compare, see how to tell if a supplement is pure, and for the protein question itself, how much protein you need.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- NSF Certified for Sport; Informed Choice
- Certificate of analysis
- Yes
| What we checked | What we found |
|---|---|
| Third-party tested Verified | NSF lists the unflavored powder (id 1756600) with four lots and no certification date. Informed Choice’s October 2026 list names “Whey Protein Isolate” from Transparent Labs. |
| Heavy metals checked Maker’s claim | The maker posts lot-level certificates of analysis for lead, cadmium, arsenic and mercury. We read lot 26081254 (lead 0.23 µg per serving). We found no figure for this isolate from an independent body. |
| A plain label Maker’s claim | Grass-fed whey protein isolate and sunflower lecithin. 28 g protein per 33.3 g scoop. No added amino acids listed. |
| Disclosed extras Maker’s claim | Unflavored has only sunflower lecithin (100 mg). Contains milk. We did not review the flavored labels. |
| A clear source Maker’s claim | Transparent Labs says the whey comes from grass-fed American dairy cattle raised without growth hormones. We saw no certifier or named farm. |
| Prop 65 notices Verified | None naming the whey in the California Attorney General’s database. Two 2025 notices name other Transparent Labs products. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Transparent Labs Grass-Fed Whey Protein Isolate product page. Maker’s page. Prices and sizes. The ingredient list is a label image on the page. Open ↗
- Transparent Labs third-party tests page. Maker’s page. Search by product name to see certificates of analysis by lot. Open ↗
- Certificate of analysis, Grass-Fed Whey Protein Isolate Unflavored, lot 26081254. Maker’s page. Posted by Transparent Labs; run by Advanced Laboratories. Marked “Preliminary Results” and labeled for the 30-serving size. Open ↗
- NSF Certified for Sport listing: Grass-Fed Whey Protein Isolate Unflavored. Certifier or regulator listing. Open ↗
- Informed Choice: list of currently certified products (October 2026). Certifier or regulator listing. Open ↗
- Consumer Reports: FAQ on its protein powder lead tests. Test report. Says only Momentous and Transparent Labs told CR they publish results. Open ↗
- Consumer Reports test results (PDF), including Transparent Labs Mass Gainer. Test report. Open ↗
- California Attorney General 60-day notices naming Transparent Labs. Certifier or regulator listing. Searched 2026-10-22. Results are for Hydrate and Prebiotic Greens, not the whey. Open ↗
Alternatives Other options to compare
- Momentous Whey Protein Isolate (unflavored) Also NSF-listed with lot reports online; lead was under 0.05 µg a serving in the two whey lots we read. About $2.80 a serving.
- Levels Grass-Fed Whey (unflavored) A concentrate with a Clean Label Project certificate and no NSF listing. About $2.07 a serving at 2 lb.
- Naked Whey, unflavored One ingredient, grass-fed whey concentrate, with nothing added. Cheaper per serving, about $1.84 for the 5 lb bag.