Glutamine

Glutamine is an amino acid (a small building block your body uses to make proteins). It has skin conditioning properties and helps skin feel comfortable.

Think of glutamine as a quiet support player in your skincare. Your skin’s outer layer (stratum corneum) needs two things to stay healthy: a strong barrier and enough moisture.

Part of what helps hold water in the skin is something called Natural Moisturizing Factors (NMF). These include amino acids or the same building blocks that make up proteins in your body.

Since glutamine is an amino acid, it falls into the “barrier-friendly, skin-conditioning” category. That’s why you’ll usually find it in hydrating and soothing formulas.

There's some experimental evidence that glutamine can calm inflammation-related skin reactions when applied topically in a contact-dermatitis model. However, it's not the same as a proven eczema fix.