Safety of Personal Care Products During Preconception
Most hair dyes, shampoos, skincare products, and makeup are generally safe to use during preconception, with the notable exception of chemical hair relaxers, which should be avoided or minimized due to evidence of reduced fertility.
Key Recommendations by Product Category
Hair Products
Hair Relaxers (Chemical Straighteners) - AVOID or MINIMIZE
- Chemical hair relaxers are associated with reduced fecundability (ability to conceive), with former users showing an 11% reduction in fertility 1
- The effect is dose-dependent: women who started using relaxers before age 10 had a 27% reduction in fecundability, and those using them for ≥10 years had a 29% reduction 1
- These products contain endocrine-disrupting chemicals that may interfere with hormonal function critical for conception
Hair Dyes - GENERALLY SAFE with caveats
- Modern hair dyes show no evidence of genotoxic, carcinogenic, or reproductive toxicity in well-designed studies 2
- Human systemic exposure to oxidative hair dyes is minimal (<1% of applied amount) 2
- However, a 2024 systematic review found an 8% increased breast cancer risk with permanent hair dye use 3, though this finding was not consistent across all studies
- Practical approach: If you choose to use hair dyes during preconception, opt for semi-permanent over permanent formulations when possible
Shampoos - SAFE
- No specific preconception concerns identified in the evidence
- Standard shampoos pose minimal systemic exposure risk
Skincare and Makeup Products
General Skincare and Cosmetics - GENERALLY SAFE
- Modern personal care products have a strong safety record with low acute toxicity 4
- The key concern is ensuring products are from reputable manufacturers, as contamination with heavy metals or microorganisms has been documented in some products 5
Critical Exception - Isotretinoin (Accutane®) for Acne
- ABSOLUTELY CONTRAINDICATED during preconception 6
- Can cause miscarriage and severe birth defects
- Must be discontinued well before attempting conception with effective contraception in place
Important Caveats and Pitfalls
What the Guidelines Don't Address
The AAFP and CDC preconception guidelines 7, 6 focus primarily on medications, supplements (folic acid), and lifestyle factors (alcohol, tobacco, diabetes management) but do not specifically address cosmetic products beyond isotretinoin. This absence suggests these products are not considered a major preconception risk factor by guideline committees.
Quality Control Matters
- A 2022 study found microbial contamination in 67% of tested cosmetic products and heavy metal impurities in most products 5
- Choose products from established, regulated manufacturers rather than unbranded or imported products of uncertain origin
The Lactation vs. Preconception Distinction
- The evidence base often conflates pregnancy, preconception, and lactation 8
- During preconception specifically, systemic exposure concerns are lower than during pregnancy since there is no developing fetus yet
- However, optimizing your body's chemical exposure burden before conception is prudent
Practical Algorithm for Decision-Making
- Discontinue immediately: Chemical hair relaxers, isotretinoin
- Continue with caution: Permanent hair dyes (consider switching to semi-permanent)
- Continue safely: Standard shampoos, makeup, and skincare from reputable brands
- Prioritize: Focus your preconception efforts on the evidence-based interventions that matter most: folic acid supplementation (400-800 mcg daily), smoking cessation, alcohol avoidance, and chronic disease management 7
The evidence suggests that while some cosmetic products warrant caution, they should not be the primary focus of preconception counseling compared to established risk factors like medication review, substance use, and chronic disease optimization.