Hydrolyzed Sodium Hyaluronate
Hydrolyzed Sodium Hyaluronate (trade name: miniHA) is a chemically fragmented, ultra-low molecular weight version of sodium hyaluronate, produced via acid, enzyme, or other hydrolysis methods. Its molecular weight is approximately 10 kDa, which is dramatically smaller than conventional hyaluronic acid (0.5–2 million Da). It is classified by CosIng as a skin conditioning agent with a primary function as a moisturizer/humectant.
Due to its very small molecular size, it is claimed to penetrate the skin more readily than standard hyaluronic acid and may moisturize deeper skin layers. According to its manufacturer, miniHA exhibits better antioxidant activity and sun protection/after-sun repair abilities than higher molecular weight HA versions. It also works synergistically with higher molecular weight HA forms, with a combination of three MW variants shown to hydrate skin significantly better than a single high-MW HA alone.
Low molecular weight hyaluronic acid (particularly fragments under 50 kDa) may act as a pro-inflammatory signaling agent in the skin; a study by Evonik on reconstituted human epidermis suggested potential pro-inflammatory effects, though results on real human skin remain uncertain. The overall benefit-risk profile of ultra-low MW HA is considered controversial by the source.
