From Root to Ritual

Postpartum hair loss affects 40–50% of new mothers. It peaks 3–4 months after delivery and can shed up to 300 hairs daily. Most women are never told why — or when it ends. The answer is in the biology of what pregnancy does to the hair cycle, why the shedding happens in a wave, and what the follicle needs to reset. Here is the full picture with a month-by-month timeline.

Hair loss is not a cosmetic problem. It is a signal from a biological system that tracks everything — cortisol, ferritin, thyroid hormones, oxygen, sleep, inflammation, microbiome. The hair is the readout. The question is not what to apply to stop it. The question is what the body is trying to communicate. This Sunday — a different way of listening.

A 2025 case-control study of 200 women found hair loss significantly associated with deficiencies in selenium, folate, vitamin B12, vitamin D, and ferritin. Meanwhile, selenium toxicity caused hair loss in 72% of people in one documented supplement outbreak. Zinc excess causes hair loss
through copper depletion. Vitamin A toxicity is a recognized cause of telogen effluvium. The supplement industry has a dosing problem — and most people using hair supplements don't know which side of the line they're on.

HIF-1α — hypoxia-inducible factor 1-alpha — is the protein your hair follicle uses to sense oxygen levels and respond to low-oxygen stress.
 When HIF-1α signaling is impaired, follicles lose their ability to adapt to circulatory stress and begin miniaturizing. A 9-month blinded clinical trial on HIF modulation counteracted hair loss across all
participants. Here is the oxygen biology most hair loss discussions never mention.
     

A double-blind, randomized, placebo-controlled clinical trial found that rosemary-lavender oil increased hair growth rate by 57%, improved thickness by 68%, increased density by 32%, and reduced hair fall by over 40% — all vs coconut oil placebo. This is RCT-level evidence. Here is what the research actually says about how essential oils work on hair — and why concentration and combination are everything.

Harvard researchers found that cortisol doesn't damage hair follicles directly.
It stops the dermal papilla from producing a molecule called Gas6 — the signal that activates resting follicle stem cells. When Gas6 was added back, stem cells reactivated even under stress conditions. Cortisol is not the enemy.
 The molecule it suppresses is the target. Here is what that changes.

Pelage Pharmaceuticals raised $120 million. Veradermics secured $150 million.
PP405 just presented at AAD 2026 and moves toward Phase 3. Hair loss is biopharma's next frontier. The pipeline is real, the science is serious, and the results are years away. Here is what $270 million is buying — and what you can do right now that the pipeline cannot yet offer.

  Clascoterone just produced 539% relative improvement in hair count vs placebo
across 1,465 men — by blocking DHT at the follicle receptor, not systemically. No sexual side effects. No systemic hormone disruption. Just local DHT  inhibition at the site where it causes harm. This is the mechanism Laritelle's topical botanical formulation has always used. The pharmaceutical field just validated it at scale.

Summer changes everything your hair is up against — UV, humidity, heat,
     sweat, salt, chlorine, and the cortisol that comes with whatever this
     season is asking of you. Most people change their products. The ritual
     stays the same. Here is why that matters more in summer than any other
     time of year.

     A 6-month study of botanical shampoo and hair tonic in AGA patients produced
     a mean 27% reduction in hair loss area — with 80% reporting significant
     improvement. The shampoo was applied once daily with intentional dwell time.
     Not twice a week with a 10-second rinse. The delivery system matters as much
     as what's in it. Here is the clinical protocol most people are not following.

More than 9 in 10 hair extensions sold in the US contain harmful chemicals
     including endocrine-disrupting substances, PFAS, and flame retardants —
     in direct contact with the scalp. A separate EWG analysis found only 21%
     of personal care products marketed to Black women rated low hazard. The
     scalp is the most absorptive surface you apply products to. What goes on
     it matters more than most people realise — and most products disclose less
     than most people assume.

The most abundant protein in your body starts declining at age 25. It is the structural foundation your hair follicles grow from. And a clinical study found it preserves the exact stem cell population that research confirms is still present in balding scalp — but failing to activate. Here is what collagen actually does for your hair — and why most supplements miss the point.