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Thorne
Whey Protein Isolate
Our analysis — editorial take, not from the label
An NSF Certified for Sport whey isolate with a short, fully disclosed ingredient list — 21 g of protein and 2.2 g of leucine per scoop, plus digestive enzymes and no artificial sweeteners.
- Protein
- 21 g
- Protein by weight
- 75%
- Source
- whey isolate
- Servings
- 30
Price tier: Premium · relative cost per full serving across this database
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Available in Vanilla and Chocolate, both naturally sweetened with stevia rather than artificial sweeteners.
Label verified: July 2026 · View label source
Label data
Per full serving · 30 servings per container · from the manufacturer's panel
| Protein per serving | 21 g |
|---|---|
| Serving size | 28 g |
| Protein per scoop | 75% |
| Calories | 100 |
| Total carbohydrate | 3 g |
| Total fat | 0.5 g |
| Source | whey isolate |
| Sweetener | stevia |
| Whey Protein Isolate | 25 g (providing 21 g protein) |
| Bromelain and Papain Blend | 30 mg |
| Calcium | 94 mg |
| Proprietary blend | Total only — source ratio undisclosed |
Primary label source: Thorne — official product page (Ingredient Amounts panel) · verified July 2026
Cautions
- Contains milk (whey protein isolate); not suitable for a dairy allergy
- Sweetened with stevia (Rebaudioside A) plus a small amount of cane sugar (3 g sugar per serving)
- Supplements food intake and does not replace whole-food protein sources
Formulated for healthy adults — not intended for anyone under 18. Full health & safety notes
Product details
Where this label sits
Thorne Whey Protein Isolate is one of the protein powders in the Scoop Sense database. The label uses at least one proprietary blend, so a blend total stands in place of the individual amounts inside it. It runs 30 servings per container at the full labeled serving. Everything on this page comes from the manufacturer's supplement facts panel as of July 2026 — never from the marketing page.
Key ingredients & studied doses
- Whey Protein Isolate · 25 g (providing 21 g protein). Complete, fast-digesting dairy protein studied for its role in supporting muscle protein synthesis after resistance training.
- Bromelain and Papain Blend · 30 mg. Plant-derived digestive enzymes included to support breakdown of the protein content.
- Calcium · 94 mg. Mineral involved in normal muscle contraction and bone maintenance.
Flavors & sweetener
Available in Vanilla and Chocolate, both naturally sweetened with stevia rather than artificial sweeteners.
Who it's best for
A standard-ratio powder — fine as a food supplement when total daily protein is what matters. Skip it if you want every individual dose disclosed on the label. Derived from the label figures above — not medical advice.
How we log this label
Every entry is built the same way: we read the current supplement facts panel, log each disclosed dose, compare it against the amounts used in published research, flag proprietary blends, and state the cautions plainly. The full methodology explains each step.
This label against the research
How we evaluate labelsEach bar shows the amount commonly used in published human research, and where this label's dose falls against it. Research amounts are context, not a recommendation — they are not doses, and nothing here is medical advice.
-
Protein21 g
At or above the studied amount0studied range 20 g–40 g50 g
Per-meal doses studied for muscle protein synthesis run about 20–40 g of high-quality protein, with the upper half of that range favoured for larger athletes and older adults.
Source: Jäger et al., Journal of the International Society of Sports Nutrition 2017 — “General recommendations are 0.25 g of a high-quality protein per kg of body weight, or an absolute dose of 20–40 g.”
-
Leucine2.2 g
At or above the studied amount0studied range 0.7 g–3 g4 g
The ISSN position stand puts an acute protein dose at 700–3000 mg of leucine, and about 1–3 g per meal as the amount needed to stimulate protein translation. Higher-leucine servings sit at the top of that span rather than beyond it.
Source: Jäger et al., Journal of the International Society of Sports Nutrition 2017 — “Acute protein doses should strive to contain 700–3000 mg of leucine and/or a higher relative leucine content”
One or more amounts on this label sit inside a proprietary blend, so the individual doses behind the blend total cannot be compared at all.
Common questions about Thorne Whey Protein Isolate
How much of a Thorne Whey Protein Isolate scoop is actually protein?
21 g of protein from a 28 g serving — about 75%. The rest is flavoring, fats, carbs, and whatever else the label lists. A higher percentage means less filler per scoop.
What does the proprietary blend in Thorne Whey Protein Isolate hide?
The Bromelain and Papain Blend lists 30 mg as a combined total. A blend total tells you the sum of its ingredients, not the individual doses inside it — which is why blend entries can't be checked against studied amounts.