Vitamin C

Is it good to take vitamin C before bed? For most healthy adults, yes. See why dose matters more than the clock, plus two overlooked bedtime risks.

What is the best time to take vitamin C tablets? No hour has been shown to beat another. Dose size, food, iron and colds matter more. Here's the evidence.

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.

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.

Pauling claimed 10g a day. Two Mayo trials found nothing. What high-dose vitamin C really does, and the ceiling oral doses cannot cross.

Description: The RDA is 90mg, research points to 200mg, and the safe ceiling is 2,000mg. A practical vitamin C dosage guide — and why absorption changes the maths.