Sodium Cocoyl Glycinate: An Amino Acid Surfactant Profile

There's a reason amino acid surfactants have taken over so much of the gentle-cleanser conversation over the past few years, and sodium cocoyl glycinate is one of the quieter workhorses in that category. It doesn't get the same spotlight as sodium cocoyl isethionate or decyl glucoside, but it's worth knowing well if you're building a low-irritation face or baby wash.

What it is, structurally

Sodium cocoyl glycinate is the sodium salt formed by combining coconut-derived fatty acids with the amino acid glycine. That amino acid backbone is the whole point of the ingredient category. Instead of the harsher sulfate or sulfonate head groups found in surfactants like sodium lauryl sulfate, amino acid surfactants use a mild, protein-adjacent structure that tends to be gentler on skin and the eye area, while still doing real cleansing work.

Property	Detail
INCI name	Sodium Cocoyl Glycinate
CAS number	Assigned per specific manufacturing source; confirm the exact CAS with your supplier's documentation, since amino acid surfactants can carry supplier-specific registry numbers
Typical function	Mild anionic surfactant, cleansing agent
Typical use level	Formulated as part of a surfactant blend rather than used alone at high concentration; check your specific supplier's recommended range
Typical form supplied	Often sold as a liquid concentrate or as part of a blended surfactant system

Worth flagging directly: this is a good example of an ingredient where the CAS number isn't a single universal figure the way it is for something simple like a common preservative. Amino acid surfactants are sometimes registered under slightly different numbers depending on the exact manufacturing process or supplier, so pulling the number straight from your specific supplier's documentation rather than assuming one figure applies everywhere is the safer habit.

Where it earns its place in a formula

The main reason to reach for sodium cocoyl glycinate over a stronger surfactant is the combination of mildness and still-solid foam and cleansing performance. It's commonly used in:

• Facial cleansers, especially for sensitive or reactive skin
• Baby washes and gentle body cleansers
• Micellar-adjacent formulas where a soft touch matters
• Blended surfactant systems where it's paired with a co-surfactant to boost foam, since amino acid surfactants alone can sometimes underperform on foam volume compared to sulfates

That last point matters for formulators. Sodium cocoyl glycinate rarely carries a formula entirely on its own. It's usually part of a blend, working alongside something like coco-glucoside or a small amount of a milder secondary surfactant to hit the foam and viscosity targets a finished product needs.

pH behavior

Amino acid surfactants as a category tend to perform and feel best in formulas closer to skin's natural pH, generally in a mildly acidic to neutral range, rather than the more alkaline range some traditional soap and surfactant systems land in. This is part of why the category gets marketed around the idea of being closer to skin's own pH. Practically, that means when you're building a cleanser around this ingredient, checking your finished formula's pH with an actual meter rather than assuming a "gentle" ingredient list guarantees a gentle final pH is worth the extra step.

Regulatory notes for a filing

There's nothing exotic about this ingredient from a Hotlist or restricted-substance standpoint. It's not a prohibited or specially restricted entry the way a preservative or a UV filter might be. The regulatory work here is mostly about accuracy rather than risk:

1. Confirm the exact INCI name from your supplier matches "Sodium Cocoyl Glycinate" precisely, since amino acid surfactant naming can vary slightly by manufacturer.
2. Get the CAS number that corresponds to your specific supplier's material, not a generic number pulled from an ingredient database.
3. If it arrives as part of a pre-blended surfactant system rather than as a standalone material, get the blend's composition so you can carry the true percentage of sodium cocoyl glycinate through into your finished-product concentration, the same way you would for a fragrance or preservative blend.

The practical takeaway

This is a genuinely useful ingredient for anyone building toward a gentler cleanser line, and it's a good example of how "mild" ingredients still deserve the same documentation discipline as anything else on a filing. Getting the exact INCI and CAS pairing right from your specific supplier, and tracking its real percentage if it comes in as part of a blend, is most of the work.

When you're pulling together the ingredient list for a filing, Cosmetic Comply matches supplier-provided ingredients like this to their correct INCI and CAS pairing and expands any blends so the real concentration carries through cleanly, which is especially handy for surfactant systems that rarely show up as a single clean percentage on a label. If your supplier's documentation on this ingredient looks thin, going back to them for a clean INCI and CAS confirmation before you file is worth the extra email.