Each capsule provides 100 mg of **grape seed extract** standardized to 90% polyphenols, alongside 320 mg of **vitamin C** as ascorbic acid. Grape seed polyphenols have moderate clinical evidence for reducing blood pressure by roughly 6 mmHg systolic and lowering markers of oxidative stress. At two capsules daily, you get 200 mg — squarely within the 150–300 mg range used in most published trials.
The 320 mg of **vitamin C** per capsule is a meaningful dose on its own — well above the RDA and enough to support your immune system and collagen production. At two capsules daily (640 mg total), you're in a range supported by research for antioxidant protection without hitting the absorption ceiling that kicks in above 1,000 mg.
The combination works well: both grape seed polyphenols and vitamin C act as antioxidants, but through different mechanisms and in different parts of your cells, giving you broader coverage. If your main goal is cardiovascular support or general antioxidant defense, the doses here are well-positioned.
BioStacks
Other Ingredients (3)
Magnesium StearateLubricant
A salt of stearic acid used as a lubricant in tablet and capsule production
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
How to Take It
Take it anytime
Plain ascorbic acid is acidic — high doses can bite on an empty stomach. Take it with food if that happens, and split doses above ~500 mg.
With or without food
Split into 2 doses across the day
On the label
Suggested Usage: Take 1 capsule twice daily with food.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$23.26
Near the median of 375 vitamin C supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from the NIH Office of Dietary Supplements and the 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. studied 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.