Articles · Topic
Hair
Hair and scalp care: washing, heat styling and colouring at home safely.
7 articles
Keratin straightening, glyoxylic acid and kidney injury: what to know
Acute kidney injury cases after straightening with glyoxylic acid, ANSES advice from January 2025, what to check on the label and which symptoms need a doctor now.
5 min readHair oiling and dandruff: why oil on the scalp may make flakes worse
Malassezia yeast needs fat and thrives on several oils in the lab. A 2023 letter warns scalp oiling may worsen seborrhoeic dermatitis. Oil the lengths instead.
4 min readDoes rosemary oil regrow hair? Reading the 100-person study everyone cites
The rosemary oil hype rests on one 2015 trial in 100 men versus 2% minoxidil, with no placebo group and no replication. Read it fully before you believe it.
5 min readHair breakage and split ends: causes, trimming, and when to see a doctor
Breakage and split ends come from friction, heat and chemicals. Split ends cannot be mended, only trimmed. How to handle hair gently, and which hair loss needs a doctor.
5 min readDyeing your hair at home safely: the 48-hour allergy test and PPD
Before home hair colour: a skin allergy test at least 48 hours ahead every time, a strand test, gloves, fresh air, never on brows or lashes, and why black henna matters.
5 min readHow to wash your hair right, and when dandruff needs a doctor
How often to wash depends on your scalp. Shampoo goes on the scalp, conditioner on the lengths, warm water not hot, and when dandruff is worth a dermatologist visit.
5 min readBlow dryers, flat irons and curling irons: heat styling with the least damage
Heat from dryers, flat irons and curling irons breaks down hair protein. Dryer distance, temperatures, heat protectant, why never to iron wet hair, and how often.
4 min read