Fulvic Acids

Fulvic acids are the low-molecular-weight fraction of humic substances in peat. Unlike humic acids, fulvic acids are soluble at all pH values, giving them higher bioavailability and skin penetration potential. They are yellow to light brown in color and represent a larger proportion of the humic fraction in sphagnum-derived peat compared to lowland peat.

Structure

Smaller and more oxygenated than humic acids, with a higher density of carboxyl (–COOH) and hydroxyl (–OH) functional groups per unit mass. This gives fulvic acids greater reactivity, chelation capacity, and water solubility despite their smaller size.

Bioavailability Advantage

The key distinction from humic acids is bioavailability. Fulvic acids can penetrate skin more readily due to their lower molecular weight. This makes them potentially more effective per unit mass in topical applications, though they are present in lower absolute quantities in most peat types.

Cosmetic Relevance

Increasingly of interest in cosmetic formulations as a mineral delivery vehicle and antioxidant. The ability to chelate minerals and transport them across biological membranes makes fulvic acids relevant for both transdermal mineral delivery in balneotherapy and active ingredient enhancement in topical products.