NutraBio · Ashwagandha (KSM-66) · Capsules
Is NutraBio KSM-66 Ashwagandha underdosed?
Verdict
600 mg–1.2 g a dayas the label directs · studies use 500–600 mg/day of KSM-66 ashwagandha
Effective doseTaken as the label directs (1–2 servings a day, 600 mg each), it gives 600 mg–1.2 g a day; studies use 500–600 mg/day. The most the directions give is above the range studies use.
One capsule gives 600 mg, enough on its own for the low end of what studies use (500 mg); it ranks 6th of 13 KSM-66 ashwagandha supplements here by dose.
1 capsule a day reaches 500 mg.
What the label says
- KSM-66 Ashwagandha per serving
- 600 mg in 1 capsule
- Servings a day
- 1–2 servings a day
- KSM-66 Ashwagandha a day, as directed
- 600 mg–1.2 g
- Research dose
- 500–600 mg/day Evidence: Moderate
Suggested use: Take 1-2 capsules daily between meals as needed.
More about KSM-66 ashwagandha: forms, timing and the studies behind the dose.
Same category, compared
All 13 KSM-66 ashwagandha supplements we checked, ranked by dose (commission never changes the order). Studies use 500–600 mg/day of KSM-66 ashwagandha; servings counted to 500 mg.
| Product | Per serving | Servings to reach it | Form |
|---|---|---|---|
| Brain Forza KSM-66 Ashwagandha | 1 g | 1 or less | Capsules |
| Double Wood KSM-66 Ashwagandha | 600 mg | 1 or less | Capsules |
| Goli Nutrition Ashwagandha Gummies | 300 mg | 1.7 | Gummies |
| Lemme Chill Gummies | 300 mg | 1.7 | Gummies |
| NOW Foods KSM-66 Ashwagandha | 600 mg | 1 or less | Capsules |
| NutraBio KSM-66 Ashwagandha (this product) | 600 mg | 1 or less | Capsules |
| Nutricost KSM-66 Capsules | 600 mg | 1 or less | Capsules |
| Planetary Herbals KSM-66 Ashwagandha Root Extract 600 mg | 600 mg | 1 or less | Capsules |
| Puritan's Pride KSM-66 Ashwagandha 450 mg | 900 mg | 1 or less | Capsules |
| SNS Serious Nutrition Solutions KSM-66 Ashwagandha | 695 mg | 1 or less | Capsules |
| Swiss BioEnergetics Ashwagandha KSM-66 1,000 mg | 1 g | 1 or less | Capsules |
| Transparent Labs KSM-66 | 600 mg | 1 or less | Capsules |
| Nootropics Depot KSM-66 Capsules 300 mg | 300 mg | 1.7 | Capsules |
Where the reference doses come from
- KSM-66 Ashwagandha, 500–600 mg/day: Li et al., 2026; Pérez-Gómez et al., 2020.
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 329337, including its servings a day.
For a supplement taken every day we judge the most the label's directions give in a day, and show the least. Read the full methodology or the corrections log.