Liposomal vs. regular vitamin C: the real difference

Why vitamin C absorption is more complicated than it seems

Vitamin C is essential for collagen synthesis, immune system function, neurotransmitter production, and protecting cells from oxidative stress. Furthermore, it is water-soluble—your body cannot store it for long and is therefore dependent on regular intake. The problem: the absorption of vitamin C from regular supplements is highly dose-dependent and hits a ceiling. Beyond a certain point, the absorption system becomes saturated and the excess is no longer utilized.

How regular vitamin C is absorbed — and where it gets stuck

Regular oral vitamin C is absorbed in the small intestine via sodium-dependent transport proteins (SVCT1 and SVCT2). These transport proteins can only process a limited amount at a time. As soon as the dose exceeds approximately 200–400 mg, they become saturated and absorption efficiency drops sharply.

Research by Levine et al. (1996) shows the following absorption percentages:

200 mg approx. 100% absorption
500 mg approx. 73% absorption
1,000 mg approx. 49% absorption
2,000 mg approx. 27% absorption

How liposomal vitamin C takes a different route

In liposomal vitamin C, ascorbic acid is encapsulated in a phospholipid vesicle. Unlike free ascorbic acid, it does not use the SVCT transport proteins. The entire liposome is absorbed via endocytosis — a different mechanism that does not depend on that same transport capacity. That is the essential difference: it is not the dose that changes, but the way the substance reaches your cells.

With high doses of regular vitamin C, loose stools can occur because non-absorbed vitamin C draws water into the intestine. Liposomal vitamin C is absorbed via a different route. Always stick to the recommended daily dose for any supplement.

What the research shows

Hickey et al. (2008) measured significantly higher plasma levels after liposomal vitamin C than after an equal regular oral dose, and these levels remained elevated for longer.
Davis et al. (2016) found that liposomal vitamin C far exceeded regular oral supplementation.
Carr & Vissers (2013), Nutrients conclude that liposomal delivery significantly increases the bioavailability of vitamin C compared to non-liposomal forms.

For our own liposomal vitamin C, a clinical study (CT-0007-17, n=24) measured a 1.76× higher bioavailability than regular vitamin C at the same dosage.

Side effects compared

With regular vitamin C: loose stools above approximately 1,000 mg, stomach cramps on an empty stomach, and at very high long-term doses, an increased risk of kidney stones.

With liposomal vitamin C: significantly less. No osmotic diarrhea, no direct stomach contact, and generally well-tolerated — even at dosages that would cause gastrointestinal issues in regular form.

Practical comparison: price, dosage, and value

Liposomal supplements cost three to five times more per milligram than regular tablets. But if a regular 1,000 mg tablet delivers about 490 mg and a 500 mg liposomal capsule delivers a comparable amount, the effective dose per euro spent is very similar. The price difference looks larger than it is once you calculate what is actually absorbed.

The PPH standard

500 mg vitamin C per capsule (625% RI)
Sunflower lecithin (GMO-free) — no soy
Stable dry form 36-month shelf life without refrigeration

Conclusion and next step

The difference between liposomal and regular vitamin C is not a marketing story, but a measurable difference in bioavailability and tolerability, supported by clinical research (CT-0007-17).

Because your vitality is not optional — it is essential.

Frequently asked questions

Vitamin C is essential during pregnancy and safe at standard dosages. Discuss higher dosages with your midwife. Sunflower lecithin is considered safe in food quantities.

No. PPH Liposomal Vitamin C uses sunflower lecithin, not soy lecithin. Suitable for people who want to avoid soy.

For daily support, 500 mg per day (one capsule) is appropriate for most adults. During illness or intense exertion, some take two. The European upper limit for supplementation is 2,000 mg per day.

Sources

Levine, M. et al. (1996). Vitamin C pharmacokinetics in healthy volunteers. PNAS. pubmed.ncbi.nlm.nih.gov/8668209/
Hickey, S. et al. (2008). Pharmacokinetics of oral vitamin C. Journal of Nutritional & Environmental Medicine. www.ncbi.nlm.nih.gov/pmc/articles/PMC5890122/
Davis, J.L. et al. (2016). Liposomal-encapsulated Ascorbic Acid: Influence on Bioavailability. Nutrition and Metabolic Insights. pubmed.ncbi.nlm.nih.gov/27499631/
Carr, A.C. & Vissers, M.C. (2013). Synthetic or food-derived vitamin C — are they equally bioavailable? Nutrients. pubmed.ncbi.nlm.nih.gov/24152206/