Dr. Rhonda Patrick on health: what the evidence says · JRE #1474
SUBJECT: HEALTH
Not a true/false call. Every claim is logged with its sources; read the exhibits below.
two grams is better than one gram for for like um reducing the duration of the common cold uh two grams is better than one and uh children are more have a more robust effect than adults so like adults like it reduces the common cold like two grams can do something like 20 reduce – reduce the duration by like 20% or something.
What the evidence says 01 / RECORD
Patrick claimed that regular vitamin C supplementation (with higher doses like 2g being more effective than 1g) reduces common cold duration by about 20% in adults and more in children. The most authoritative synthesis of the evidence, a Cochrane systematic review and meta-analysis of 31 trial comparisons (Hemila & Chalker, updated 2013), found that regular vitamin C supplementation reduced cold duration by 8% (95% CI 3-12%) in adults and by 14% (95% CI 7-21%) in children, with an 18% reduction specifically at 1-2 g/day doses in children. The review also found that taking vitamin C only after cold symptoms begin (therapeutic use, as opposed to regular daily supplementation) produced no consistent benefit on duration or severity. The 20% figure Patrick cites for adults roughly doubles the actual pooled adult estimate from the meta-analysis, though it is closer to figures reported for children at higher doses. The NIH Office of Dietary Supplements corroborates the Cochrane findings, describing the adult effect as a modest 8% reduction in duration and confirming no effect when vitamin C is started after symptoms appear.