Ingredient

Threonine

Neutral in 3

What is Threonine?

Threonine is an essential amino acid, meaning that it cannot be synthesized by the human body and must be obtained from diet. It's commonly found in protein-rich foods such as meat, eggs, and dairy products.

In products, threonine is often included for its role in protein synthesis and as a supplement ingredient, aimed at supporting muscle growth and repair. Scientific research generally views threonine positively for these functions, though the necessity of supplementation varies depending on individual dietary intake.

When you see threonine on a label, it typically signifies a focus on protein content or amino acid supplementation, especially in products like dietary supplements or protein drinks.

Commonly found in: supplements, protein powders, fortified foods, meal replacements, performance beverages

Benefits

  • Threonine supports protein synthesis in the body.
  • It's essential for muscle growth and repair.
FDA

Threonine is generally recognized as safe (GRAS) when used in conventional foods.

Research

Research supports its role in muscle growth and repair, although supplementation is usually beneficial for those with low dietary intake.

Vegan

Threonine can be sourced from both animal and plant-based proteins, making it suitable for vegans if plant-derived.

Sources: Aminosyran: Threonine in Human Nutrition

Scout's take

Threonine is an amino acid that helps to improve skin hydration and elasticity. It is used in formulations to support skin repair and regeneration. It is generally considered safe for use in skincare.

The case against

There are minimal risks, though it may cause irritation in very sensitive skin.

from the analysis of Eucerin Advanced Repair Lotion for Very Dry Skin Bottle

There are minimal risks associated with threonine in cosmetics.

from the analysis of The Ordinary - The Natural Moisturizing Factors + HA( / )

Generally considered safe with low risk of irritation.

from the analysis of Salt & Stone Body Wash - Bergamot & Hinoki

The case for

It helps to improve skin texture and supports collagen production.

from the analysis of The Ordinary - The Natural Moisturizing Factors + HA( / )

Threonine may help improve skin hydration and elasticity.

from the analysis of Eucerin Advanced Repair Lotion for Very Dry Skin Bottle

Supports skin hydration and improves texture.

from the analysis of Salt & Stone Body Wash - Bergamot & Hinoki

More from Scout's analyses

Threonine is an amino acid used in skincare for its potential moisturizing properties. It may help improve skin hydration and elasticity. Its benefits in topical application are not well-established.

from the analysis of Eucerin Advanced Repair Lotion for Very Dry Skin Bottle

Threonine is an amino acid used for its conditioning properties. It helps in maintaining skin hydration.

from the analysis of Salt & Stone Body Wash - Bergamot & Hinoki

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