Vitamin C

What happens if I take 1000mg of vitamin C daily? Your blood saturates, absorption drops, and the surplus heads to your kidneys. Here's what research shows.

Is vitamin C good for hair growth? It helps if you're low. See what deficiency does to hair, why iron matters more, and what the research hasn't shown. 

Does vitamin C lower cortisol? Not reliably. See what the trials found, where the 2,000 mg daily upper limit sits, and what helps your cortisol more.

Liposomal vitamin C vs regular vitamin C: 9 of 10 trials found better absorption, but no trial has yet shown a clear health benefit. See when it's worth it.

The best foods high in vitamin C, what storage and cooking strip out before you eat them, and why 41.8% of US adults still have insufficient blood levels.

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. 

Vitamin C dosage: the RDA is 75mg for women and 90mg for men, research points to 200mg, and 2,000mg is the upper limit. How absorption changes the maths.

Vitamin C dosage: the RDA is 75mg for women and 90mg for men, research points to 200mg, and the upper limit is 2,000mg — and absorption changes the maths.

Sustained 1,000mg vitamin C doses blunted mitochondrial gains in trials. What athletes should know about oxidative stress, recovery and race-week timing.

Surgery drops plasma vitamin C by 39% in the first week, and 21% of patients start deficient. What the evidence says about vitamin C wound healing.

Vitamin C interactions with warfarin, statins, chemotherapy, antacids and thyroid medication — what the research shows and when to involve a physician.