Dry skin is not really a hydration problem

Your dermatologist may have mentioned this. Your favorite skincare influencer almost certainly has not.

TODAY'S TOPIC: Skin and Hair

"Skin absorbs certain skincare ingredients more effectively at night than in the morning."

This is a detail that gets lost in most product marketing. Skin does not behave identically around the clock.

Skin cell turnover and repair processes increase overnight, and research in chronodermatology has found skin permeability to certain active ingredients, like retinoids, is measurably higher at night. This is part of why many dermatologists recommend specific actives for evening use rather than morning.

The timing is not just habit. Your skin is genuinely more receptive at that hour.

"Hair grows measurably faster in the summer months than in the winter."

This sounds like the kind of thing that should not be true, and yet the research backs it up. Seasons genuinely affect the hair growth cycle.

Increased daylight exposure and warmer temperatures are linked to a higher percentage of hair follicles in their active growth phase during summer months. A few studies tracking hair growth rate across seasons have found a measurable, if modest, increase compared to winter.

Your hair is not growing at a fixed, constant rate all year. It has a season it prefers.

"Dry skin in midlife is mainly caused by not drinking enough water."

Dehydrated skin and dry skin sound like the same problem, and they get treated that way constantly. They are not actually the same mechanism.

Skin dryness in midlife is driven primarily by declining estrogen, which reduces the skin's natural oil production and weakens its outer barrier function. Drinking more water supports overall hydration, but well-established research shows it has limited effect on skin barrier dryness once that hormonal shift is underway.

More water in your glass will not fix a barrier problem. That one needs a different kind of attention.

Hormones rarely work in the single, tidy roles they get assigned. Yours are running a more complicated show than the shorthand versions suggest.