The chemical form of compounds in dietary supplements significantly influences their nutrient bioavailability.

Study: Liposomal delivery enhances absorption of vitamin C into plasma and leukocytes: a double-blind, placebo-controlled, randomized trial

This study found that vitamin C wrapped in tiny fat bubbles (liposomal form) gets absorbed better by the body than regular vitamin C pills, proving that how the nutrient is packaged changes how well your body can use it.

Study: A clinical evaluation of liposomal (Lipomac™) versus nonliposomal vitamin C: A randomized, open-label, cross-over trial in healthy subjects

This study found that vitamin C wrapped in tiny fat bubbles (liposomal) gets absorbed much better by the body than regular vitamin C pills, proving that how the nutrient is structured affects how well your body can use it.

Study: Biokinetics in humans of RRR-alpha-tocopherol: the free phenol, acetate ester, and succinate ester forms of vitamin E.

This study found that different versions of vitamin E in supplements were absorbed by the body about the same, even though they looked chemically different. So, the shape of the molecule doesn’t seem to make a big difference in how much your body can use.

Study: Influence of Diet on Bioaccessibility of Iron from Dietary Supplements and Medicinal Products—Results of In Vitro Digestion Model and Analytical Determinations

This study found that not all iron supplements are absorbed the same — some forms, like iron sulfate, are absorbed much better than others, like iron lactate. So yes, the chemical shape of the nutrient matters for how well your body can use it.