The CIR Expert Panel concluded that formaldehyde and
methylene glycol are safe for use in cosmetics when formulated
to ensure use at the minimal effective concentration, but in no
case should the formalin (note 1) concentration exceed 0.2%
(w/w), which would be 0.074% (w/w) calculated as formaldehyde or 0.118% (w/w) calculated as methylene glycol.https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/PRNS547.pdf
Be aware - don't see it listed in Annex V - Cosmetic Directivehttps://ec.europa.eu/growth/tools-databases/cosing/pdf/COSING_Annex V_v2.pdf
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