Ingredient

Riboflavin

Vitamin B2 Lactoflavin E101

What it is

A water-soluble B-vitamin with a natural yellow-orange color, used in skincare as an antioxidant and conditioning agent.

It helps neutralize reactive oxygen species generated by UV exposure and pollution and supports the skin's natural cellular energy metabolism.

Skin conditioning Antioxidant

Well tolerated

No significant safety concern is reported for this ingredient as used in cosmetics.

Generally well tolerated

Recognised for a well-studied benefit.

Well tolerated

Riboflavin (vitamin B2, E101, PubChem CID 493570) is a well-characterized essential vitamin with a long history of safe topical and dietary use and no meaningful irritation or sensitization signal at cosmetic levels; the 'antioxidant' label overstates its topical function — CosIng lists it as a skin-conditioning agent, and applied riboflavin is in fact photoreactive rather than a robust free-radical scavenger — so 'well_tolerated' is the more honest green code.

Round Lab