Form Comparison

Ascorbic Acid vs Liposomal Vitamin C

How ascorbic acid and liposomal vitamin C differ in potency, absorption, tolerance, and cost.

This page contains affiliate links. Titrate earns a small commission when you purchase through them, at no cost to you. This does not affect our recommendations.

Quick verdict. Below about 500 mg a day, choose ascorbic acid: it is absorbed at 70-90% and costs a fraction of liposomal. Liposomal vitamin C produced modestly higher plasma levels than plain oral doses in small studies, still far below intravenous levels, and it causes less GI upset at gram doses. It is worth the price only if you take a gram or more daily and plain vitamin C gives you diarrhea.

Side by Side

Ascorbic Acid Liposomal Vitamin C
Active content 100% ascorbic acid Varies by product
Absorption High Moderate
How it is absorbed Absorbed by sodium-dependent vitamin C transporters (SVCT1). Absorption is 70-90% at 30-180 mg/day and falls below 50% above 1 g/day as transporters saturate. Ascorbic acid encapsulated in phospholipid vesicles, proposed to bypass transporter saturation. Small studies show modestly higher plasma levels than unencapsulated oral doses, well below intravenous levels.
Typical dose 75-500 mg daily 500-1,000 mg daily
Common uses general supplementation, enhancing non-heme iron absorption high-dose oral regimens
Side effects Diarrhea and GI upset above about 2 g/day. May raise kidney stone risk in susceptible people. Less GI upset at high doses than plain ascorbic acid.
Cost Low High
Also called L-ascorbic acid lipospheric vitamin C
Labels in index 2,104 8

When to Choose Ascorbic Acid

Choose ascorbic acid when you want the reference form at the lowest cost. The reference form. The NIH ODS fact sheet notes that natural and synthetic ascorbic acid are chemically identical.

Ascorbic Acid

All the vitamin C most people can use, at the lowest cost.

What to look for: 100-250 mg tablets. Split larger daily amounts into two doses.

Find on iHerb Affiliate link

When to Choose Liposomal Vitamin C

Choose liposomal vitamin C when you take gram doses and plain vitamin C causes GI upset. The advantage matters only at doses above about 500 mg, where plain ascorbic acid absorption declines.

Liposomal Vitamin C

Higher plasma levels than plain tablets in one small study, and still nowhere near IV levels. The premium rarely makes sense.

What to look for: If used, milligrams of ascorbate per serving stated plainly. Ignore IV comparisons.

Find on iHerb Affiliate link

Products on Titrate

In Titrate's index of NIH label data, 2,104 labels named as vitamin C products list ascorbic acid and 8 list liposomal vitamin C.

Open supplement search

Vitamin C does not have its own search category yet. Each product above links to its full label in the NIH database.

Related

References

NIH Office of Dietary Supplements. Vitamin C: Fact Sheet for Health Professionals.

Levine M, et al. Vitamin C pharmacokinetics in healthy volunteers: evidence for a recommended dietary allowance. Proc Natl Acad Sci U S A. 1996;93(8):3704-3709.

Padayatty SJ, et al. Vitamin C pharmacokinetics: implications for oral and intravenous use. Ann Intern Med. 2004;140(7):533-537.

Hemilä H, Chalker E. Vitamin C for preventing and treating the common cold. Cochrane Database Syst Rev. 2013;(1):CD000980.

Thomas LD, et al. Ascorbic acid supplements and kidney stone incidence among men: a prospective study. JAMA Intern Med. 2013;173(5):386-388.

Davis JL, et al. Liposomal-encapsulated Ascorbic Acid: Influence on Vitamin C Bioavailability and Capacity to Protect Against Ischemia-Reperfusion Injury. Nutr Metab Insights. 2016;9:25-30.