Ingredient review
Sodium Glycinate
INCI: Sodium Glycinate
A gentle, water-loving amino acid salt that helps hydrate skin and keep product pH balanced without irritation.
In plain English
Sodium Glycinate is a simple salt made from glycine, one of the building blocks of proteins. In skincare, it acts like a tiny sponge that pulls moisture into the skin, helping it stay soft and hydrated. It also helps keep the product's acidity level just right, so other ingredients work well and your skin stays comfortable. Think of it as a mild, supportive helper that boosts hydration without being sticky or heavy.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Sodium Glycinate is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Sodium Glycinate.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Sodium Glycinate is the sodium salt of the amino acid glycine. It is a white, crystalline powder that dissolves easily in water. It is produced synthetically for cosmetics, though glycine itself is naturally found in the body and in protein-rich foods.
How it works
As a humectant, Sodium Glycinate attracts water molecules from the environment and from deeper layers of the skin, holding them on the surface to reduce water loss. Its small molecular size allows it to penetrate the outer skin layer, delivering hydration where it's needed. Additionally, it acts as a buffering agent, helping to maintain a stable, skin-friendly pH (typically around 5.5) in the product, which supports the skin's natural barrier.
Pros
Gentle hydration
Sodium Glycinate attracts moisture without causing stinging or irritation, making it ideal for sensitive or reactive skin.
pH balancing support
It helps keep the product's pH in the optimal range for skin, which can improve the performance of other ingredients and reduce the risk of irritation.
Cons and cautions
Mild humectant power
Compared to glycerin or hyaluronic acid, Sodium Glycinate provides lighter hydration, so it may not be enough for very dry skin on its own.
Often used in low amounts
It is typically present at low concentrations (under 2%), so its hydrating effect is subtle and works best as part of a broader moisturizing formula.
Best for
- Anyone looking for a lightweight, non-greasy hydrating ingredient
- People with sensitive or easily irritated skin who want gentle moisture
- Those who prefer products with a balanced, skin-friendly pH
Use caution if
- Individuals seeking intense, long-lasting hydration may need a more potent humectant
Usage tips
Safety summary
Sodium Glycinate is considered safe for topical use in cosmetics. It has low irritation and sensitization potential, and no known toxicity at typical concentrations. It is non-comedogenic and suitable for all skin types, including sensitive skin.
Research notes
Research on Sodium Glycinate specifically is limited, but glycine and its salts are well-studied as safe humectants and buffering agents. They are components of the skin's natural moisturizing factor and are widely used in dermatological formulations without adverse effects.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. No known restrictions at typical use levels.
- Common uses
- Serums, Moisturizers, Cleansers, Toners
- Environmental note
- Sodium Glycinate is biodegradable and has a low environmental impact when used in rinse-off products.
Good to know
- Sodium Glycinate is often used alongside other amino acid salts in 'natural moisturizing factor' (NMF) blends.
- It is considered very safe and is approved for use in cosmetics globally, including by the FDA and EU CosIng database.
Common questions
What is Sodium Glycinate in beauty products?
Sodium Glycinate is a simple salt made from glycine, one of the building blocks of proteins. In skincare, it acts like a tiny sponge that pulls moisture into the skin, helping it stay soft and hydrated. It also helps keep the product's acidity level just right, so other ingredients work well and your skin stays comfortable. Think of it as a mild, supportive helper that boosts hydration without being sticky or heavy.
What does Sodium Glycinate do in a beauty product?
As a humectant, Sodium Glycinate attracts water molecules from the environment and from deeper layers of the skin, holding them on the surface to reduce water loss. Its small molecular size allows it to penetrate the outer skin layer, delivering hydration where it's needed. Additionally, it acts as a buffering agent, helping to maintain a stable, skin-friendly pH (typically around 5.5) in the product, which supports the skin's natural barrier.
Is Sodium Glycinate safe for most people?
Sodium Glycinate is considered safe for topical use in cosmetics. It has low irritation and sensitization potential, and no known toxicity at typical concentrations. It is non-comedogenic and suitable for all skin types, including sensitive skin.
Who should be careful with Sodium Glycinate?
Individuals seeking intense, long-lasting hydration may need a more potent humectant
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.