What it is
Alanyl glutamine is a small dipeptide formed by linking alanine and glutamine, two common amino acids. In cosmetic formulas it functions as a skin-conditioning agent and can contribute to surface hydration. In sunscreens it is a supporting ingredient and does not contribute to UV protection.
Safety & warnings
As a small amino-acid-based peptide, it is generally well tolerated in leave-on products and is not a recognized fragrance allergen or a comedogenic oil. Sensitive users may patch test as a precaution.
Origin & sourcing
Synthetic peptide, manufactured by joining the two constituent amino acids; the amino acids themselves are often produced by fermentation.
Questions everyone asks
What does alanyl glutamine do in a sunscreen?
It acts as a skin-conditioning and hydrating support ingredient; it does not affect the level of UV protection.
Is it the same as glutamine?
No. It is a dipeptide that links alanine to glutamine, which can be more stable in formula than free glutamine alone.