You're getting 1,000mg of **Vitamin C** per capsule — right in the middle of the clinically studied supplement range (250–2,000mg) and well above the 90mg RDA that only prevents deficiency. At this dose, you're covered for immune support and collagen synthesis, the two areas where vitamin C has the strongest research behind it. One capsule a day is all you need.
The form here is standard **ascorbic acid**, which is well-absorbed at this dose level but hits a ceiling — your body's absorption efficiency drops noticeably above 1,000mg per sitting. If you ever wanted to take more than one capsule, splitting doses throughout the day would help you absorb more of it. Buffered forms like calcium ascorbate are gentler on the stomach if you're sensitive.
At 1,000mg you're at half the 2,000mg tolerable upper limit, so there's room to increase if your needs call for it — though most people won't need to.
BioStacks
Best for
Ingredients (1)
Vitamin C
100%Dose
1000 mg
Target
250–2000 mg
Form
Budget
Other Ingredients (2)
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
HypromelloseCapsule
Plant-derived capsule material from cellulose
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.