Is henna safe during pregnancy?

What does the evidence say about henna hair dye during pregnancy?

1. Testing of black henna products sold in one Gulf-region market found PPD present in every black henna sample tested, at concentrations from 0.4% to 29.5%, and eight of the samples exceeded the 2.0% maximum concentration recommended for hair dyes. 1
2. PPD exposure has been linked to acute allergic contact dermatitis, chemical burns, kidney failure, and severe swelling reactions, and the same research described a fatal case in a G6PD-deficient infant following henna exposure. 1
3. Pure henna itself, without added PPD, appears nontoxic when applied to the skin in laboratory research, and its natural pigment, lawsone, did not affect the survival of skin cells in testing. 2
4. Henna's natural bioactivity can still cause serious harm in a different way: infants with G6PD deficiency, a genetic condition affecting an estimated 400 million people worldwide, have developed severe hemolytic reactions and dangerously high bilirubin levels after direct skin application of henna, which is why clinicians recommend avoiding henna on infants until G6PD status is confirmed. 3
5. MotherToBaby's general guidance on hair products during pregnancy notes that when products are used as directed, the amount of dye absorbed through healthy, unbroken scalp skin is small, and using hair color products as directed is not expected to greatly increase the chance of birth defects. 4

Is henna hair dye safe in each trimester?

• First trimester. There's no pregnancy-specific research on henna itself, so first-trimester guidance leans on the same general principle used for other hair products: minimal scalp absorption when a product is used as directed on healthy, unbroken skin.
• Second trimester. If a mehndi or henna appointment is part of a celebration during your pregnancy, the main practical safeguard is confirming the product is plain, natural henna rather than a black henna blend, since that is where the PPD risk concentrates.
• Third trimester. Keep the same PPD caution in mind if you're considering henna for a baby shower design or for a newborn later: infants with G6PD deficiency, an inherited condition, have had serious reactions to direct henna application, which is why it's kept away from babies until that status is known.