There are clarifying shampoos, purifying scrubs, even specialized conditioners—here’s how much of it is actually necessary.

Our hair does just change over time,” Jo told me while visiting Freija Collective in Los Angeles. Jo whipped out her scalp camera to get up close and personal with what was going on atop my head.

"Without proper mitigation, hard water causes mineral build-up on the scalp, which can weaken roots, strip the scalp of natural oils, and impact the efficacy of the products you use on your hair ...

Healthy hair starts with a healthy scalp ... I spoke to experts about the benefits of scalp massaging and rounded up their recommendations for the best scalp brushes and massagers to use.