Biotin shampoo can potentially improve hair health by strengthening the hair shaft and reducing breakage. However, its effectiveness is debated, as biotin absorption through the scalp is limited. Results vary depending on individual needs and hair condition.

There isn't a single 'best' shampoo for thinning hair, as the ideal choice depends on the cause of thinning. Look for shampoos containing ingredients like biotin, saw palmetto, ketoconazole, or caffeine, and consider consulting a dermatologist for personalized recommendations.

Biotin shampoo can typically be used 2-3 times per week. Overuse could potentially lead to product buildup on the scalp, so adjust frequency based on your hair type and how it responds to the shampoo.

Hair types that are fine, thinning, or prone to breakage may benefit most from biotin shampoo. It can help to strengthen the hair shaft and reduce further damage, leading to a fuller appearance. Those with oily scalps should ensure the formula is not too heavy.