Threonine at a glance

  • An essential amino acid that provides hydrating benefits
  • Most often found in blends with other skin care ingredients
  • Part of peptides that contribute to visibly firmer skin
  • In the body, threonine plays a signaling role to maintain health

Threonine description

Threonine is an amino acid that can provide anti-ageing and hydration benefits as a skin care ingredient. It is categorise as an essential amino acids] (essential amino acids are amino acids that are not produced by the body itself).

Threonine references

  • Clinical, Cosmetic and Investigational Dermatology, November 2016, pages 411–419
  • International Journal of Toxicology, November 2013, pages 41S–64S
  • PubChem, accessed June 2022

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.