Vitamin C

What diseases can vitamin C prevent? Just one — scurvy. What the randomized trials actually found on colds, heart disease, cancer and eye disease.

What is Ester-C vitamin used for? The same jobs as any vitamin C. Its real edge is a gentler stomach, not better absorption. See what the research shows.

Is Ester-C better than regular vitamin C? Gentler on sensitive stomachs, yes. Better absorbed, only inconsistently. What the trials show, and who paid for them.

Can I take vitamin D and C together? Yes. Learn why they don't compete, how to time them with food, what immune research shows, and which limits to respect. 

What does vitamin C do for you? It builds collagen, stocks immune cells, unlocks plant iron and aids 18 enzymes. What the evidence shows, and what it doesn't. 

Older adults eat as much vitamin C as younger adults but carry less in their blood. What the research says about vitamin C for seniors and what to do.

Vitamin C for smokers: why requirements run 35mg higher, why deficiency is 3x more common, and what the evidence says about effective daily intake. 

Vitamin C for colds will not stop you catching one. The trials do show a 26% cut in severe symptoms, plus one group where prevention genuinely works.

Your immune cells hold 50-100x more vitamin C than your blood. What that means for the vitamin C immune system link, and what supplementing really does.