https://coremedscience.com/blogs/wellness/how-to-pick-the-best-liposomal-vitamin-c
There are two basic types of liposomal supplements that have to do with "liposome" formation. The first is an already formed liposome vitamin C and, while the other is a pro-liposome. A pro-liposome is chemically bound vitamin C and contains phospholipids in a manner which will result in a liposome formation in the presence of water at body temperature.
The simplest way to tell if a product is a formed liposome is if the ingredients include water. If water is in the ingredients, you are likely dealing with formed liposomes. If not, you are looking at a pro-liposome. Make sure however that both contain phospholipids like phosphatidylcholine (derived from lecithin).
A pro-liposome has the potential to become a liposome when exposed to water, forcing the phospholipids to immediately congregate by natural hydrophobic forces into a bi-layer as described above.
In the form of a pro-liposomal powder, the vitamin C is surrounded (conjugated) by a layer of phospholipids and other fats in a special technical process that can greatly vary in effectiveness. How well this proprietary process of binding the lipids to the vitamin C occurs is key, because if the lipids and the vitamin C are only mixed together (not bound), the formation of liposomes with vitamin C inside will be sporadic at best as the vitamin C can just disperse away separately from the lipids.
