What’s in the Tub
Our Amazon link points to the Chocolate in a 28-serving tub (38.5 oz). Mind the scoop math: the 20 grams of protein are per serving of 2 scoops (39 grams), not per scoop. Each serving has 160 calories, 9 grams of carbs, 3 grams of fiber, 2 grams of sugar (all of it added), 7 grams of fat including 4 grams saturated, and 330 mg of sodium.
The protein comes from five plant sources: organic pea protein, flax seed, quinoa, pumpkin seed protein and chia seed. KOS doesn’t disclose BCAAs or leucine. Sweetness comes from organic coconut sugar, stevia and monk fruit, with no erythritol or sucralose.
Then come the extras. A superfoods blend adds coconut milk, inulin, acacia and fruit, vegetable and shiitake powders. There’s a digestive enzyme blend (proteases, amylases, cellulase, lactase and lipase) and a vitamin and mineral mix that includes 5 mg of iron (30% of the daily value) and 40% of the daily value for B12, but no vitamin D. It contains coconut. Captain Vegan’s opinion: this powder packed for a long trip and brought snacks.
Taste and Texture: What Reviewers Say
Reviewers don’t agree on the flavor. Garage Gym Reviews’ tester tried Chocolate and Vanilla, scored taste 3 of 5 and summed it up as “not great, but it’s not offensive.” BarBend’s reviewer gave the Vanilla 6.8 of 10 for taste and compared it to “de-fatted peanut butter,” milder than most. On the sunnier side, VegFAQs called the flavor really good with no real aftertaste, and FitnessVolt described it as sweet, creamy and more dessert-like than many plant proteins.
Mixing is the sore spot. GGR said two scoops take real effort to mix and scored solubility 3 of 5. BarBend said it mixed very well in water but poorly in almond milk. VegFAQs said it really didn’t mix well and scored it 9.375 of 25 for clumping. Customer complaints that GGR noted include a bad aftertaste and strong sweetness. Captain Vegan’s opinion: this is a blender powder wearing a shaker-bottle costume.
Safety and Testing
Consumer Reports tested KOS Vanilla (a 37-gram serving) and published the results in October 2025. Lead measured 112% of CR’s daily level of concern per serving, with a limit of 6¼ servings a week. That was the lowest of the four top-10 powders in CR’s October 2025 test, ahead of PlantFusion (140%), Orgain (143%) and Vega (185%). Ritual, tested in CR’s January 2026 follow-up, came in lower at 107%. CR’s result is for the Vanilla; our link is the Chocolate.
The Chocolate label carries a California Prop 65 warning that it can expose you to lead. KOS also settled a Prop 65 lead case brought by ERC: the settlement came in December 2025, with judgment in February 2026, and it requires lead under 0.5 µg a day or a warning. ERC also served a December 2023 notice over lead in KOS Vanilla and Chocolate, and an April 2023 notice alleging PFOA in three flavors, with no levels given and no lawsuit reported. Notices are allegations, not findings.
KOS says every product is third-party tested for lead, arsenic, cadmium and mercury at ISO 17025-accredited labs, and batch COAs can be looked up by lot number. It doesn’t publish the levels, though, and brand testing isn’t a certification. KOS has no NSF Certified for Sport or Informed Choice listing. Our research turned up no recalls. Trust, but bring your lot number.
How It Scored
KOS scored 56 out of 100 on our formula. Protein quality earned 14 of 25, the lowest in our top 10: 6.7 points for 20 grams per serving and 5 for the multi-source blend, but only 2 of 10 for density, because just 50% of its calories come from protein. Value scored 15 of 25: measured by what 20 grams of protein cost at the Amazon price on our Nov 3, 2026 scoring date, it’s the third most expensive in our top 10.
Purity scored 11 of 25, tied for the lowest in the lineup: the 15-point baseline with no certification bonus, minus 2 for CR’s 112% lead result and 2 more for the Prop 65 label warning and settled lead case. Taste and mixing earned 16 of 25: 12.8 of 20 for taste from Garage Gym Reviews and BarBend, and 2.8 of 5 for mixing, averaged from GGR, BarBend and VegFAQs, the lowest mixing score in our top 10. The flavor shows up; the shaker files a complaint.
How It Compares
Orgain Organic Protein (No. 9, 56/100) ties KOS on points and is its closest rival: another multi-source blend that costs less per gram of protein. But CR measured more lead in its Vanilla Bean (143%, Oct 2025), it faces a July 2026 class action over lead (an allegation), and reviewers rate its taste lower.
Garden of Life RAW Organic (No. 4, 70/100) is also USDA Organic, packs 22 grams of protein into one 130-calorie scoop and is NSF Contents Certified, though CR hasn’t tested it. Ritual Essential Protein (No. 7, 63/100) mixes far better and posted a lower CR result (107%, Chocolate, Jan 2026), but costs much more per gram. Sticking with KOS? Our recipes page puts the blender to work.