Whey Protein Isolate

Purity. Retail concentrate runs about 70 to 80% protein; the remainder is fat, carbohydrate, and lactose. Isolate is filtered to 90% protein or higher, and the reference composition tables put it near 0.5% lactose and 0.5% milk fat, against 10 to 55% lactose and 2 to 10% fat for concentrate. WP-01 is cold microfiltered to ≥90%. That's why it's very low in lactose, and why people who don't tolerate concentrate often handle isolate without trouble.

Whey protein isolate is the most expensive form of whey to produce, and it earns the price: a complete essential amino acid profile, top scores on the standard protein-quality indices, and at least 90% protein by weight after cold microfiltration. On top of that, we re-verify every incoming lot and pay an independent lab to test every batch. There are also no cheap ingredients in the pouch to bring the cost of goods down, since we skip the fillers, flavors, and sweeteners entirely.

The useful way to compare protein prices is cost per gram of protein. A lot of tubs look cheaper because they hold fewer servings, or put fewer grams of protein in each scoop, so the sticker price is lower while the protein itself costs more.

Yes, and it is one of the clearest wins available to you. A 2026 meta-analysis of 20 trials found that a quarter to nearly 40% of the weight lost on GLP-1s is lean mass, and that resistance training brings it down to 17.5% when protein is adequate. Protein is what makes that possible. A scoop of our whey is 25g protein, which keeps the target within reach on the days food is unappealing. No known interaction with your medication.

Any time of day works. After physical activity is a good window: muscle protein synthesis stays elevated for roughly 24 hours post-exercise, and getting protein in feeds that response. Still, the research is consistent that your total daily protein matters far more than the timing of any single shake, so hit your daily target first.

Yes, and that's one of the reasons WP-01 exists. It's a true isolate, not a concentrate: cold microfiltration strips out nearly all of the lactose, leaving under a gram per serving (a glass of milk carries roughly twelve). People who can't tolerate concentrate or milk routinely handle WP-01 without GI trouble. If your intolerance is severe, start with a half-scoop.

For active adults, the literature lands around 1.6 to 2.2g/kg per day. WP-01 gives you 25g a scoop. For a 75 kg adult, one to two scoops usually closes the gap between what you eat and where you want to land. It is a tool to top up real food, not a replacement for it.

Every additive is a tradeoff. Sweeteners aren't universally tolerated; gums add fermentation load to the gut; and most flavoring is there to cover for low-quality whey. Ours has nothing to cover. Protein, lecithin, nothing else. Add flavor at the blender if you want it.

For mixability. Whey isolate clumps in cold liquid without an emulsifier; lecithin breaks the surface tension so the powder disperses instead of floating in lumps. We use a minimal amount, under 1% of the formula, GRAS-classified, and a source of phosphatidylcholine, the precursor your body uses to make choline. It is the one additive that does real work here.

Yes, our cows are grass-fed and never treated with rBST or rBGH.

But: for whey protein isolate, those labels are largely cosmetic. Bovine growth hormone doesn't survive pasteurization or your stomach, and the fatty-acid differences between grass-fed and grain-fed milk are filtered out during isolation. What's left is 90%+ protein, biochemically indistinguishable.

What actually matters here is on every batch's third-party COA: purity, dose accuracy, heavy metals, microbial load.

In adults with normal baseline renal function (eGFR ≥60 mL/min/1.73 m²), higher-protein intake has not been shown to accelerate renal decline; a systematic review and meta-analysis found no adverse effect of high-protein diets on GFR in healthy adults. The concern is extrapolated from CKD-specific data and does not apply to this population. Individualize intake in patients with established CKD, proteinuria, or a solitary kidney before recommending supplemental whey.

In obese, non-diabetic women, whey supplementation did not worsen hepatic steatosis or metabolic markers. The Bortolotti trial (Clin Nutr, 2011) reported that intrahepatocellular lipid fell ~21% over four weeks, alongside reductions in fasting triglycerides (~15%) and total cholesterol (~7%), with no adverse effect on glucose tolerance or creatinine clearance. Evidence in decompensated cirrhosis is lacking, so individualize there.

Yes. Every finished lot is tested by an ISO 17025 accredited third-party laboratory, and we publish the full result for each one on its own page, so you can read the measured values for the exact lot in your bag before you buy it. Our current batch is lot 60498, where you can see the identity, heavy-metal and microbiological results next to the specification each one had to clear. Every published batch is listed on the testing page.

In three layers. First, manufacturing: our products are made in an FDA-registered, NSF-certified facility operating under cGMP, with verification steps throughout production. Second, independent testing: every finished lot is tested by an ISO 17025 accredited third-party laboratory for identity, purity, heavy metals, and microbial safety. Third, transparency: we publish the full results for every batch on our testing page, so you can look up the lot number printed on your pouch and read the measured values yourself.

We do not hold the NSF Certified for Sport certification, a program built for competitive athletes that certifies with a logo rather than published results. Our products are made in an NSF-certified, FDA-registered, cGMP facility, with identity and quality checks at multiple steps of production, and every finished lot is independently tested by an ISO 17025 accredited laboratory for identity, heavy metals, and microbials. We publish the complete numerical results for each batch, so you can look up the exact lot in your hands. If you compete under a governing body that requires Certified for Sport products, check its rules before supplementing.

A meta-analysis of nine RCTs in overweight and obese adults found whey supplementation produced significant reductions in body weight and fat mass, with improvements across several cardiovascular risk markers: systolic and diastolic blood pressure, fasting glucose, HDL, and total cholesterol. Best positioned as an adjunct to a structured, energy-restricted, resistance-training program rather than a standalone intervention.

Adults >65 show blunted muscle protein synthesis at standard doses; PROT-AGE consensus recommends 1.0 to 1.2g/kg/day (1.2 to 1.5g/kg in acute or chronic illness), distributed as 25 to 30g of a leucine-rich source like whey per meal.

Every order is covered by a 60-day guarantee. If you're not satisfied, return it within 60 days of delivery for a refund or replacement, for any reason. Full details are in our Refund Policy.

We ship within the United States. Orders ship from our US fulfillment center within 1 business day.

Yes. Every batch is third-party tested, and you can look up the results by lot.

In an NSF- and UL-registered, SQF-certified GMP facility in the US.

We review ingredients rigorously and publish our reasoning in the Formulary. We only sell what we'd take ourselves. Of the ingredients we've reviewed, we've rejected 95%.