How to Clear Hair Buildup Before a Lab Test

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Before a lab test, hair product buildup can skew results, especially if they're checking for heavy metals or hormones. To clear it, wash your hair twice with a clarifying shampoo, focusing on the scalp and roots. Let the first lather sit for a minute to break down oils and silicones, then rinse thoroughly. Follow with a gentle conditioner only on the ends. Avoid styling products, gels, or oils for at least 24 hours prior. If you use dry shampoo, brush it out completely and do a final rinse with…