"No Formaldehyde" is not an ingredient itself but a formulation/marketing claim indicating a product is free of formaldehyde and, ideally, formaldehyde-releasing preservatives. It is used to signal reduced risk of contact sensitization to formaldehyde-sensitive individuals.
| Reported effect | How often | Notes |
|---|---|---|
| No direct side effects (absence claim) | Very rare | As a claim rather than an active substance, it has no inherent adverse effects; any reactions would stem from the actual preservatives used in its place. |
| Sensitization from alternative preservatives | Uncommon | Formaldehyde-free formulas may substitute other preservatives (e.g., parabens, isothiazolinones) that can themselves cause contact allergy in some users. |
| Misleading labeling risk | Rare | Some products labeled formaldehyde-free may still contain formaldehyde-releasing agents, potentially exposing sensitive individuals. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.