NutraBio · Caffeine pills · Capsules
Is NutraBio Caffeine 200 mg underdosed?
Verdict
200 mg per servingone dose · studies use 3–6 mg/kg of caffeine
Below research doseOne serving contains 200 mg; studies use 3–6 mg/kg (225–450 mg at 75 kg) in one dose before training. The label's directions allow 1–3 servings a day. Studies dose caffeine by bodyweight, so the caffeine calculator works out your own range. Taken as often as the directions allow, that is 600 mg a day, above the FDA's 400 mg daily reference for most adults.
One capsule gives 200 mg, 89% of 225 mg at 75 kg; it ranks 11th of 20 caffeine pills here by dose.
What the label says
- Caffeine per serving
- 200 mg in 1 capsule
- Servings a day
- 1–3 servings a day
- Caffeine a day, as directed
- 200–600 mg
- Research dose
- 3–6 mg/kg Evidence: Strong
Suggested Use: Take one (1) capsule up to three (3) times daily as needed.
More about caffeine: forms, timing and the studies behind the dose.
Same category, compared
All 20 caffeine pills we checked, ranked by dose (commission never changes the order). Studies use 3–6 mg/kg of caffeine.
| Product | Per serving | Share of 225 mg at 75 kg | Form |
|---|---|---|---|
| CVS Caffeine Alertness Aid | 200 mg | 89% | Tablets |
| DG Health Alert | 200 mg | 89% | Tablets |
| Equate (Walmart) Stay Awake | 200 mg | 89% | Tablets |
| Good Neighbor Pharmacy Alert Aid | 200 mg | 89% | Tablets |
| Jet-Alert Double Strength | 200 mg | 89% | Tablets |
| Kaged PurCaf Caffeine | 200 mg | 89% | Capsules |
| Kroger Stay Awake | 200 mg | 89% | Tablets |
| Leader Caffeine Tablets | 200 mg | 89% | Tablets |
| Natrol High Caffeine 200 mg | 200 mg | 89% | Tablets |
| NoDoz Alertness Aid | 200 mg | 89% | Tablets |
| NutraBio Caffeine 200 mg (this product) | 200 mg | 89% | Capsules |
| Nutricost Caffeine 200 mg | 200 mg | 89% | Capsules |
| ProLab Caffeine 200 mg | 200 mg | 89% | Tablets |
| Puritan's Pride Caffeine 200 mg | 200 mg | 89% | Capsules |
| Rite Aid Stay Awake | 200 mg | 89% | Tablets |
| Vivarin Caffeine Alertness Aid | 200 mg | 89% | Tablets |
| Walgreens Awake Maximum Strength | 200 mg | 89% | Tablets |
| Genius Caffeine | 100 mg | 44% | Capsules |
| Jet-Alert Regular Strength | 100 mg | 44% | Tablets |
| Nutricost Caffeine 100 mg | 100 mg | 44% | Capsules |
Where the reference doses come from
- Caffeine, 3–6 mg/kg: Guest et al., 2021.
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 318066, including its servings a day.
For a supplement taken as one dose we judge one serving, and show the most the label allows in a day. Read the full methodology or the corrections log.