Definition Guide for skin and hair care terms. A to Z Glossary of hair & skin ingredients with effective results. Updated regularly.
- L-Ascorbic Acid
- L-Ascorbic Acid is a potent form of Vitamin C. It is fresh and concentrated. L-ascorbic acid is a vitamin C that can be applied as a topical skin treatment. Vitamin C is the only antioxidant proven to stimulate collagen production.
- L-Cysteine is necessary to build Keratin. Hair is 14% cysteine. It is included in some hair growth supplements.
- L-Methionine is for hair structure and strength. It is included in some hair supplements to prevent hair breakage and thinning mid-length.
- Lactic acid
- Lactic acid exfoliates and brightens skin. It is gentler than glycolic acid. Lactic acid holds moisture while increasing firmness and skin thickness.
- Lanolin is a natural oil from sheep’s wool. It is easily absorbed and protects and soothes skin. Commonly used in lip balms and moisturizers.
Lavender Essential Oil
- Lavender Oil softens and conditions the hair.
- Age spots.
- Licorice Root
- Licorice root contains glabridin, is a potent antioxidant that soothes skin. It lightens dark circles gently, improves uneven tone and skin redness. it is safe for even sensitive skin. 
- Lingonberry Stem Cells
- Lingonberry stem cells increase natural antioxidant mechanisms in skin cells. This decreases skin irritation and inflammation. Lingonberry is a “superfruit”. It is rich in vitamins C and E, both excellent for repairing and preventing sun damage.
- Linseed Oil
- Linseed Oil helps hair damaged by styling tools. High in Omega 3s, Linseed can be massaged into the scalp to nourish the hair for new growth, and restore damaged hair.
1. Natural Product Research, December 2007, pages 1,234-1,239