Naturally occurring, colorless polyunsaturated fatty acid liquid that functions as a skin-conditioning agent and cell-communicating ingredient. Also known as alpha-linolenic acid, this ingredient is a plant-based omega-3 fatty acid that occurs in vegetable oil and flax seed oil as well as canola and soy oils. Walnuts are a top dietary source of this fatty acid. Linolenic acid has research showing topical application helps improve many skin concerns, including eczema, psoriasis, acne, and non-melanoma skin cancers. 
Linolenic acid can help repair skin’s barrier function and reduce pro-inflammatory substances that would otherwise cause damage. It’s believed to communicate with cells that comprise skin’s immune system, as evidenced by research showing that topical linolenic (and similar) fatty acids improve wound healing. 
- McCusker M, Grant-Kels J. Healing fats of the skin: the structural and immunologic roles of the omega-6 and omega-3 fatty acids. Clin Dermatol.. 2010;28(4):440-51.
- Cardoso C, Souza M, Ferro E, Favoreto Jr S, Pena J. Influence of topical administration of n-3 and n-6 essential and n-9 nonessential fatty acids on the healing of cutaneous wounds. Wound Repair Regen. 2004;12(2):235-43.
gamma linolenic acid (GLA)