"A practical supplier guide to Soybean Lecithin (CAS 8002-43-5, C42H80NO8P, MW 758.06, EINECS 232-307-2): the natural phospholipid complex recovered from soybean oil that emulsifies, wets, and carries actives across food, cosmetics, and pharma. Covers its real spec data (pale brown-yellow viscous solution, density 1.0305, GRAS status, -20 C storage), food and supplement uses, cosmetic pairing with squalane, ethylhexylglycerin, lauryl betaine, sodium lauroylsarcosinate, kojic acid, alpha-arbutin, L-ascorbic acid, vitamin A1 retinol, glycolic acid, urea, GHK-Cu, creatine, citric acid and D-tartaric acid, plus grade, GMO-traceability, and documentation notes for procurement."
-Deshangchemical-chemechemi
Soybean Lecithin (CAS 8002-43-5): The Natural Phospholipid That Emulsifies, Nourishes, and Stabilizes
Soybean lecithin is one of those raw materials that quietly holds a thousand formulations together. Chemically it is a complex of phosphatides — mostly phosphatidylcholine, phosphatidylethanolamine, and phosphatidylinositol — recovered from soybean oil during refining. On the spec sheet it carries CAS 8002-43-5, the molecular formula C42H80NO8P, a molecular weight of 758.06, and EINECS 232-307-2. In practice it is the natural emulsifier, wetting agent, and surface-active material that food technologists, cosmetic formulators, and pharmaceutical producers reach for when they need something that works with the body rather than against it.
| Property | Value |
|---|---|
| CAS number | 8002-43-5 |
| Molecular formula | C42H80NO8P |
| Molecular weight | 758.06 |
| EINECS | 232-307-2 |
| Form | Solution (pale brown to yellow, viscous) |
| Density (d4²&sup4;) | 1.0305 |
| Melting point | >145 °C (decomposition) |
| Solubility | Chloroform ~0.1 g/mL, slightly hazy, slightly yellow to deep orange |
| Color | Pale brown to yellow |
| Storage temperature | -20 °C |
| Regulatory | FDA GRAS food-grade status; EU GMO traceability required |
What the spec sheet actually tells you
Commercial soybean lecithin is typically supplied as a pale brown to yellow, viscous fluid or semi-fluid, with a density around d4²&sup4; 1.0305. It softens and decomposes above 145 °C, and it dissolves in chloroform (about 0.1 g/mL) as a slightly hazy, slightly yellow to deep orange solution. It carries a GRAS food-grade status under FDA rules and is used in products people eat, apply, and take. Storage is normally held at -20 °C for the more sensitive grades, which keeps the unsaturated phospholipid fraction from oxidizing before it reaches the line.
Why formulators keep it in the toolbox
The value of lecithin is not a single trick. It is a set of overlapping functions that cover most of what a mixed oil-water system asks for:
- Emulsification. Lecithin lowers interfacial tension between oil and water, which is why it shows up in chocolate, spreads, and salad dressings. In chocolate it controls viscosity and limits fat bloom; in baked goods it works as a release agent and crumb softener.
- Wetting and dispersion. As a natural surface-active material it helps powders wet out and stay suspended, useful in instant drinks, dry blends, and industrial pastes.
- Nutrition and function. Because it is rich in phosphatidylcholine, lecithin is a practical dietary source of choline, which supports liver function, brain health, and lipid metabolism. That is the reason it appears in softgels, powdered drink mixes, and liver-support supplements.
How it behaves in cosmetics
In personal care, lecithin does quiet but important work. It is lipophilic enough to carry oil-soluble actives into the upper layers of the skin, which makes it a useful companion to emollients such as squalane and conditioning agents like ethylhexylglycerin. Inside a cleansing system it pairs well with mild surfactants — lauryl betaine and sodium lauroylsarcosinate — to soften the feel of a wash and take the edge off harsher cleansers.
When a formula is built around brightening or antioxidant actives, lecithin helps stabilize the lipid phase that carries kojic acid, alpha-arbutin, L-ascorbic acid, and vitamin A1 retinol. It also supports gentle exfoliating and humectant actives such as glycolic acid and urea in leave-on treatments where the oil phase needs to stay even.
Food, pharma, and supplement uses
In food, the same emulsifying backbone earns its place in chocolate, spreads, instant beverages, and bakery. It reduces stickiness, improves machinability on production lines, and extends shelf stability without leaning on synthetic emulsifiers.
In pharma and supplements, lecithin is used as a lipophilic carrier and a choline source. It is often paired with peptide actives such as GHK-Cu and with energy and recovery ingredients like creatine monohydrate when a product needs both a functional phospholipid and a stable delivery matrix. It also sits comfortably next to acidulants and chelators — citric acid anhydrous and D-tartaric acid — in buffered or pH-managed systems.
Buying notes for procurement
When you source soybean lecithin, a few practical points matter more than the headline CAS number:
- Grade and form. Food, pharmaceutical, and cosmetic grades differ in purity, solvent residues, and peroxide limits. Match the grade to your intended use and to your market's residue rules.
- GMO and traceability. EU GMO regulations require traceability of non-GMO raw materials. If you sell into Europe or serve non-GMO brands, ask for the non-GMO certificate and the origin declaration before you quote.
- Acetone-insoluble content. This is the common proxy for phosphatide content and a fair way to compare lots. A higher acetone-insoluble figure usually means a more concentrated phospholipid profile.
- Packaging and shelf life. Lecithin is sensitive to oxidation. Check the packaging (drums or IBCs with nitrogen blanketing are common for bulk), the recommended storage temperature, and the lot's manufacturing date before you commit volume.
- Documentation. For pharma and supplement use, request a current Certificate of Analysis, heavy-metal and pesticide profiles where relevant, and any allergen statements.
The bottom line
Soybean lecithin is not a glamorous ingredient, and it does not need to be. It is the dependable phospholipid that keeps emulsions stable, moves actives where they need to go, and adds a measure of nutritional function at the same time. For buyers who want one well-documented raw material that spans food, cosmetics, and pharma, it remains one of the safer bets on the shelf — provided you check the grade, the GMO status, and the paperwork before you buy. See the full specification on the soybean lecithin product page for current lots and documentation.
