Is kojic acid safe during pregnancy?

What does the evidence say about kojic acid during pregnancy?

1. Kojic acid works by inhibiting tyrosinase, the enzyme that drives melanin production, and is used in skincare products to address pigmentation disorders like melasma, post-inflammatory hyperpigmentation, freckles, and age spots. 1
2. A dermatology review of melasma care lists kojic acid as commonly used at 1 to 4 percent concentration in combination with other lightening agents, distinct from agents specifically called out as unsafe in pregnancy like hydroquinone and tretinoin. 2
3. A head-to-head trial of 2 percent kojic acid cream against cysteamine for melasma found kojic acid well tolerated, with no abnormal clinical or functional signs reported and no complaints of itching, burning, or irritation over the 16-week study period, though the researchers also noted that a recent safety review had suggested reducing kojic acid use pending further evaluation. 3
4. General guidance on cosmetic ingredient absorption in pregnancy notes that dermal absorption is the primary way topical cosmetic chemicals reach the bloodstream, and that some cosmetic compounds are known to cross the placental barrier, which is the general reasoning behind favoring ingredients with more established pregnancy data when equivalent options exist. 4
5. Dermatology literature identifies azelaic acid and niacinamide specifically as safe for use in pregnant and breastfeeding patients, giving a documented alternative for pigment concerns when a provider wants to avoid an ingredient like kojic acid that lacks dedicated pregnancy research. 2

Is kojic acid safe in each trimester?

• First trimester. Melasma often intensifies now due to rising hormones, and pregnancy-safe alternatives like azelaic acid have more direct backing in dermatology literature than kojic acid does, since kojic acid hasn't been studied in pregnant people specifically.
• Second trimester. Same guidance continues. If you're already using a kojic acid product and it's a rinse-off formula like a soap or cleanser, that involves less skin contact time than a leave-on serum or cream.
• Third trimester. Same guidance continues. Consistent sun protection remains the best-evidenced way to keep pregnancy-related pigmentation from worsening, regardless of which active ingredients are in your routine.