Rankings / Immune & Inflammation

Vitamin C (ascorbic acid)

Immune & Inflammation · Essential vitamin / antioxidant

Tier A

Reviewed by Read Off Label · Last reviewed · How we grade

vitaminantioxidantotc
8 / 10
Tier A
Ev 8 Bn 5 Sf 9

Bottom line

Read Off Label grades Vitamin C (ascorbic acid) as A (8.0/10) based on strong evidence, moderate benefit magnitude, and a low-risk safety profile.

Absorption plateaus around 200-400 mg per dose — larger single doses have diminishing returns.

Typical use: 500-1000 mg/day PO typically; biohacker mega-doses 2-5 g/day split; IV 25-100 g Riordan-style (off-label) — OTC (oral); Rx.

What this is

Absorption plateaus around 200-400 mg per dose — larger single doses have diminishing returns. IV route bypasses absorption limit for pharmacological levels. Liposomal claims of better absorption have weak data. Hemilä cold meta: ~8% duration reduction with ≥1 g/day chronic supplementation.

Mechanism

Water-soluble antioxidant; required for collagen hydroxylation, catecholamine synthesis, carnitine synthesis; cofactor for Fe and Cu-dependent enzymes; immune cell function requires adequate levels

Dose & route

500-1000 mg/day PO typically; biohacker mega-doses 2-5 g/day split; IV 25-100 g Riordan-style (off-label)

Citations

Links go to the source. If a link is dead or you want something re-checked, let me know.

Common questions

Does Vitamin C (ascorbic acid) work?
Read Off Label rates the evidence for Vitamin C (ascorbic acid) as Strong and the benefit magnitude as moderate, producing an overall grade of A (8.0/10). Absorption plateaus around 200-400 mg per dose — larger single doses have diminishing returns.
Is Vitamin C (ascorbic acid) safe?
Vitamin C (ascorbic acid) has a low risk profile in published human data. Legal status: OTC (oral); Rx (IV high-dose pharmacy compounding). This is not medical advice — see the disclaimer.
What is the typical dose for Vitamin C (ascorbic acid)?
500-1000 mg/day PO typically; biohacker mega-doses 2-5 g/day split; IV 25-100 g Riordan-style (off-label)
How does Vitamin C (ascorbic acid) work?
Water-soluble antioxidant; required for collagen hydroxylation, catecholamine synthesis, carnitine synthesis; cofactor for Fe and Cu-dependent enzymes; immune cell function requires adequate levels

This is an independent synthesis of published research by a non-clinician. Scores are opinions supported by citations, not prescriptions. See the full disclaimer and methodology for how this score was produced and what it does and doesn't mean.