Alanine

Alanine is a naturally occurring, non-essential amino acid, meaning the body can make it on its own. But, both supplementally, and when used in skincare, it can have many benefits.

Beyond beauty, alanine also plays a role in physical performance and muscle health.

In skincare, it’s valued for being effective yet kind and gentle to skin. It helps to support hydration and comfort without feeling heavy or irritating (1).

• It occurs naturally in the human body
• Is an amino acid and natural building block of protein
• Supports skin structure and appearance
• Helps skin retain moisture
• Known for its calming feel when applied topically

Skin hydration: Alanine helps hydrate the skin by drawing in and holding moisture, acting as a crucial component in maintaining the skin's hydration levels. It acts as a humectant and is part of the skin's Natural Moisturising Factors (NMF). The NMF helps to bind water, keeping the skin soft and flexible (2).

Supports youthful-looking skin: As an amino acid, it aids in collagen synthesis to combat sagging and wrinkles. By supporting these proteins, it helps maintain skin's firmness. And, for this reason, it is used in skincare products as a conditioning agent to promote a supple complexion (3).

Stronger skin barrier: Alanine also helps strengthen the skin's natural barrier. In scientific terms, alanine maintains the “brick and mortar” structure of the skin, reducing transepidermal water loss (TEWL) and protecting the skin from external irritants and pollutants. It’s said that regular use helps the skin bounce back from stress and environmental damage (4).

Benefits for sensitive skin: Alanine is recognised as a beneficial ingredient for sensitive, easily irritated skin types due to its gentle and calming properties, mainly due to its resistance to external stressors and reducing discomfort. To add to that, studies show that L-alanine rarely causes adverse reactions or allergies, making it generally a safe option for delicate skin types.

Alanine is commonly found in moisturising creams, serums and lotions. It performs especially well in lightweight, water-based formulas designed to boost hydration and improve skin texture. You may see it frequently used in Korean skincare routines.

Alanine is also used in hair care, where it helps strengthen the hair strands to improve texture and reduce static, leaving hair feeling smoother and more manageable.