Forget hairspray and pins – this serum is the leave-in formula that nurtures the scalp and holds baby hairs at the start of your hairline firm. It takes the fight to flyaways when wearing your hair up, and it’s packed with goodness to support baby hair as it grows through to maturity. Forget hairspray and pins – this serum is the leave-in formula that nurtures the scalp and holds baby hairs at the start of your hairline firm. It takes the fight to flyaways when wearing your hair up, and it’s packed with goodness to support baby hair as it grows through to maturity.