Lysolecithin

Overview

Lysolecithin is a modified phospholipid derived from soybean lecithin. Standard lecithin is a decent emulsifier on its own, but lysolecithin takes things further — the molecule has been enzymatically cleaved to remove one fatty acid chain, which makes it far more hydrophilic and a much stronger O/W emulsifier. The commercial form is typically sold as a blend of lysolecithin in glycerin and soy extract, appearing as a viscous amber liquid.

The HLB sits around 14.9, placing it firmly in O/W territory. What makes lysolecithin stand out from other natural emulsifiers is its versatility: it works cold-process (no heating required), handles oil phases from 5% up to 40%, tolerates pH 4-8, and plays well with all common gums, polar oils, and non-polar oils alike. It also works hot-process if your formula requires it.

The emulsions it produces are characteristically silky with low-to-medium viscosity — thin enough to be sprayable when you want them to be, or thickened with gums and co-emulsifiers when you need a cream. Shelf life of the raw material is typically 12-18 months stored cool and sealed.

What it does in a formula

Lysolecithin forms stable O/W emulsions by anchoring at the oil-water interface with its single fatty acid tail in the oil phase and its large phospholipid head in the water phase. Because the molecule is skin-identical (phospholipids are a major component of the skin’s own lipid barrier), the resulting emulsions feel lightweight and absorb cleanly without greasiness.

The low-to-medium viscosity it naturally produces is a feature, not a limitation. For body sprays, mists, and fluid lotions, lysolecithin delivers out of the box. For thicker creams, pair it with a gum (xanthan, cellulose) or a co-emulsifier (cetearyl alcohol, glyceryl stearate). The stability is impressive — properly made lysolecithin emulsions hold up well through temperature cycling and long-term storage.

How to use

Can be added to either the water phase or the oil phase. For cold-process: combine lysolecithin with the water phase, then slowly add the oil phase while mixing with a high-shear mixer or immersion blender. For hot-process: add to either phase before combining and blend as usual.

Usage rates by product type:

• Fluid lotions and body milks: 2-4%
• Sprayable body emulsions: 1-3%
• Face creams (with co-emulsifier): 2-5%
• Hair milk sprays: 1-3%
• After-sun sprays: 1-3%
• Serum emulsions (low oil load): 1-2%
• Rich body creams (high oil load, 30-40%): 3-5%

Best for / Worst for

Best for: cold-process formulas, sprayable emulsions, fluid lotions, formulators who want one emulsifier that handles low and high oil loads, sensitive skin products (phospholipid-based, skin-identical), formulas that need to work across a wide pH range.

Worst for: anhydrous formulas (it needs water to function), formulators who need a very thick cream from the emulsifier alone (you will need thickeners), anyone with soy allergy concerns in their customer base.

Common pitfalls

Skipping the high-shear mixing. Lysolecithin needs proper blending — a spoon or low-speed paddle will not create a stable emulsion. Use an immersion blender or overhead mixer.

Expecting thick cream without thickeners. The natural viscosity is low-to-medium. If you want a rich cream, add a gum or wax co-emulsifier. Lysolecithin alone gives you a fluid or light lotion.

Soy allergen disclosure. Lysolecithin is soy-derived. While the allergenic protein content is minimal in the finished cosmetic, customers with soy allergies may have concerns. Label accordingly.

Overheating unnecessarily. One of the biggest advantages is cold-process capability. Heating to 70-80 C works but is not required and wastes the ingredient’s main selling point.

Substitutes

• Lecithin (standard soy or sunflower) — lower HLB, less stable alone, but similar phospholipid chemistry. Needs higher usage and often a co-emulsifier.
• Sucrose stearate / sucrose palmitate — natural O/W emulsifiers with good skin feel, but typically require hot process.
• Olivem 1000 (cetearyl olivate and sorbitan olivate) — popular natural O/W emulsifier, but hot-process only and creates thicker textures.
• Montanov 68 (cetearyl alcohol and cetearyl glucoside) — strong natural O/W emulsifier, hot-process, produces richer creams.