What it is
This ingredient is derived from the outer peel of the lemon (Citrus limon) and is added to formulas as a botanical with a fresh citrus scent and a light astringent feel. The peel naturally contains flavonoids and citric acid, which contribute to its conditioning and freshening character. In sunscreens it appears at low levels as a supporting botanical rather than as an active sun filter.
Safety & warnings
Citrus peel materials can carry residual peel oils rich in limonene and citral, which are recognized fragrance allergens, so sensitive or fragrance-reactive users may notice irritation. Expressed lemon peel oils are also associated with furocoumarins that can cause phototoxic reactions, though purified extracts used at low levels in finished products are formulated to limit this risk.
Origin & sourcing
Natural; obtained from the peel of lemon fruit (Citrus limon), typically by solvent or aqueous extraction.
Questions everyone asks
Is lemon peel extract a sunscreen active?
No. It is used as a conditioning and aromatic botanical and does not provide measured UV protection in a formula.
Can lemon peel extract cause sensitivity?
It can in some people, mainly because of naturally occurring fragrance components like limonene and citral and potential photosensitizing compounds in citrus peel.