What is 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).

Alanine at a glance:

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

Key skincare benefits of alanine include:

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.

Common skincare uses and formulations with alanine

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.

Other uses of alanine

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.

Recommended products containing alanine:

John Masters Hero Hair Care Collection

Viridian Balanced Amino Acid Complex

OSKIA Isotonic Hydra Serum

Salt & Stone Body Wash

Viridian Ultimate Beauty Collagen Pro Factors

Safety and suitability

Alanine is considered gentle and suitable for most skin types. While reactions are rare, those with very sensitive skin may prefer to carry out a patch test before regular use.

Alanine for health

Outside of skincare, alanine also supports physical performance, particularly in its beta-alanine form. Beta-alanine is commonly used to help the body cope with high-intensity exercise by supporting muscle endurance and delaying the effects of fatigue (5).

By increasing levels of carnosine in the muscles, beta-alanine helps buffer the outcomes of intense activity, making demanding workouts feel more sustainable over time (6).

Health and performance benefits of alanine include:

Supporting short, high-intensity activities such as sprinting, HIIT and cycling

Helping delay muscle fatigue during demanding exercise

Improving overall work capacity and endurance

Supporting muscle health and function in ageing adults

It may also boost mental and physical resilience under stress

Safety and precautions:

A temporary tingling sensation on the skin can occur for some people, but this is considered harmless.

Anyone who is pregnant, breastfeeding or under medical care should seek professional advice before use, for supplemental use.

Key takeaways

Alanine is a versatile amino acid with many benefits. In skincare, it supports hydration, comfort and structure. Meanwhile, in health and performance it plays a role in endurance and muscle support.