Vitamins and Hair Loss
Discover which nutritional deficiencies can cause hair loss. Learn what clinical guidelines say about vitamins, blood tests, and safe supplementation.
Reviewed 7 Oct 2026
Hair Library · Category
Hair Care & Ingredients
Hair oils, shampoos, serums and supplements, the active ingredients inside them, and what the evidence says about each.
Entries
Collagen for Hair Growth
Can collagen help hair growth? What trials found on hair count, thickness and hair fall, which collagen types were tested, and the side effects and limits.
Reviewed 13 Oct 2026
Oils for Hair Growth
Oils for hair growth, oil by oil: which have human trials (rosemary, pumpkin seed), which only help the hair shaft, and how to use each one without irritating your scalp.
Rosemary Oil for Hair Loss
Rosemary oil for hair loss, checked study by study: the one trial against minoxidil, how long it takes, how to use it safely, side effects and what guidelines say.
Ketoconazole Shampoo
How to use ketoconazole shampoo as the NHS and US labels describe: steps, how often for dandruff and seborrheic dermatitis, side effects and when to stop.
Reviewed 13 Oct 2026
Hair Growth Serums
Does hair growth serum work? Which serum ingredients have trials, how long results take by the label, how to apply a serum, and the side effects to watch for.
Reviewed 13 Oct 2026
Mustard Oil for Hair
Mustard oil for hair, checked study by study: no human hair trial, why it burns the scalp, what it does to the skin barrier, dandruff claims, dark-patch risk and safer use.
Oregano Oil for Hair
Oregano oil for hair, checked study by study: no human trial, two mouse tests of carvacrol, lab work on dandruff yeast, how to use it safely and its side effects.
Thickening Hair Naturally
How to thicken hair naturally: what makes hair thin, which home remedies have been tested, what to do if they fail, and when thin hair can grow thick again.
Reviewed 13 Oct 2026
Key terms
What is ketoconazole?
Ketoconazole is an antifungal medicine sold as a shampoo. It is fungicidal, blocking the ergosterol that scalp yeast needs for its cell membrane.
Full entry: Ketoconazole Shampoo →