Hemp Therapies Wiki / Liposomal Delivery Systems

Liposomal Vitamin C

Liposomal vitamin C is one of the most commonly marketed liposomal nutrient formats, and its pharmacokinetic comparison against standard ascorbic acid has been studied directly in clinical research.

Plasma and Leukocyte Uptake

In a randomized, double-blind, placebo-controlled, crossover study with 27 participants, a single 500 mg dose of liposomal vitamin C, standard vitamin C, and placebo were each tested across three trial visits with 3-day washout periods between them, with blood drawn at 11 timepoints over 24 hours. Liposomal vitamin C achieved a 27% higher maximum plasma concentration and a 21% higher plasma area-under-curve than standard vitamin C in that study; both active formulations showed significantly greater plasma values than placebo. In leukocytes (white blood cells) specifically, liposomal vitamin C produced a 20% higher maximum concentration and an 8% higher area-under-curve than standard vitamin C. Time-to-peak plasma concentration was reported as 4 hours for both forms, with no adverse events reported for either formulation. The liposomal formulation tested was composed of ascorbic acid, sunflower lecithin, gum arabic, and alginate. Clinical studies cited in the broader research literature describe liposomal vitamin C taken orally as up to 1.77 times more bioavailable than non-liposomal vitamin C in some comparisons.

Reported Fold-Increases Across Studies

A scoping review of the available literature identified nine studies comparing liposomal to non-liposomal ascorbate, reporting a range of 1.2- to 5.4-fold higher maximum plasma concentration and 1.3- to 7.2-fold higher total absorption for liposomal formulations, depending on the specific study and formulation tested. Reported fold-increases vary substantially from study to study, reflecting differences in formulation composition — lipid type, particle size, encapsulation method — and study design.

Open Research Gaps

Although liposomal vitamin C’s pharmacokinetic advantages — higher blood and leukocyte concentrations — are documented across multiple studies, only a limited number of studies have examined whether those pharmacokinetic differences translate into measurable clinical outcomes, such as immune response, infection rates, or wound recovery. The phospholipid bilayer structure of a liposome is cited as the mechanism enabling encapsulation and uptake of both hydrophilic substances like ascorbic acid and hydrophobic substances within the same particle. Vitamin C’s stability during transit through the gastrointestinal tract, and its resulting bioavailability, are described in the literature as limiting factors for standard, non-encapsulated oral vitamin C.

Product Format

A common liquid liposomal vitamin C serving size is one teaspoon (about 5 mL), often delivering 1,000 mg of vitamin C per dose in commercial products.

Summary

Multiple clinical studies report higher plasma and leukocyte vitamin C concentrations from liposomal formulations compared with standard ascorbic acid, though whether those pharmacokinetic differences translate into measurable clinical outcomes remains a comparatively under-studied question.