Pantene

Pantene is the drugstore brand that's been quietly putting active ingredients into shampoo and leave-on treatments, and the data shows it's working — less shedding, denser-looking hair over time. The Abundant & Strong Daily Scalp & Root Serum is the standout here, a lightweight leave-in that creators consistently use as part of a nightly scalp routine. The trade-off: some of the classic moisturizing formulas can feel heavy on fine hair, so it's worth picking based on your specific hair type.