Best for General Health
Best Vitamin C for General Health
Top 30 products ranked · Reviewed May 2026 · 250–2000 mg clinical dose
Why Vitamin C for General Health
Vitamin C plays a supporting role in general health. Potent antioxidant and cofactor for collagen synthesis, immune function, and iron absorption. Liposomal vitamin C provides significantly higher bioavailability than standard ascorbic acid by encapsulating the molecule in phospholipid spheres for enhanced cellular uptake.
What dose to look for
Clinical studies typically use 250–2000 mg of vitamin c. Common supplement range; UL is 2000 mg/day. Products below this range may not deliver meaningful results.
What form to look for
Avoid ascorbic acid — standard form — absorption drops above 1,000mg. Avoid ester-c — marketing claims, unclear benefit over standard forms. Avoid ascorbyl palmitate — fat-soluble form, limited bioavailability data. Look for calcium ascorbate or liposomal vitamin c for better absorption.
What the research says
Vitamin C has strong clinical evidence for general health benefits. Cochrane review of 29 trials found it reduces cold duration 8% in adults; key cofactor for collagen synthesis Learn more
Clinical research on Vitamin C
HIGH for scurvy prevention; MODERATE for cold duration; null for cancer/CVD prevention · 75–90 mg/day (RDA); plasma saturates around 200 mg/day
- •Cochrane pooled 29 trials (11,306 people): daily vitamin C did NOT prevent colds in the general population. It shortened duration modestly — ~8% in adults, ~14% in children.
- •Experimental scurvy: volunteers on a vitamin-C-free diet developed bleeding gums and perifollicular hemorrhages within ~4 weeks; 10 mg/day fully reversed it. The basis for the RDA.
- •8-year trial in 14,641 male physicians: 500 mg/day vitamin C produced no reduction in total cancer. The largest, cleanest cancer-prevention test came back null.
- •LOVIT: 863 ICU sepsis patients on IV vitamin C did WORSE than placebo (44.5% vs 38.5% death or organ dysfunction at day 28). Reversed earlier enthusiasm.