Red Light Therapy
Does red light therapy work for hair loss? Review the evidence, who may benefit, how LLLT is used, expected results, safety, devices and alternatives.
Reviewed 21 Oct 2026
Hair Library · Category
Hair Loss Treatments
What published research says about medicines, light therapy and other treatments for hair loss, including their side effects.
Entries
Spironolactone for Hair Loss
Does spironolactone work for hair loss in women? What studies found, how long it takes, side effects, potassium tests, pregnancy risks and why men avoid it.
Reviewed 23 Oct 2026
Post-Finasteride Syndrome
PFS hair guide: what post-finasteride syndrome is, what regulators and trials say, whether it can be treated or prevented, and what happens to hair after.
Reviewed 13 Oct 2026
Minoxidil for Eyebrows
Minoxidil for eyebrows is off-label. What the brow trials found, side effects near the eyes, Latisse vs minoxidil, and when an eyebrow transplant fits better.
Reviewed 13 Oct 2026
Hims for Hair Loss
Does Hims work for hair loss? What it prescribes, which products are FDA-approved, what patient data show and how Hims compares with Rogaine, Keeps and Roman.
Reviewed 13 Oct 2026
Regrowing Hair in 3 Weeks?
Can you regrow hair in 3 weeks? How the hair growth cycle sets the pace, what is realistic in 21 days, which home remedies were tested, and a starting plan.
Reviewed 13 Oct 2026
Planned entries
Topics this category still needs. Each is written from peer-reviewed sources and medically reviewed before it is published.
FinasterideMinoxidil
Key terms
What is finasteride?
Finasteride blocks the enzyme that turns testosterone into DHT, the hormone that shrinks follicles in male pattern hair loss. It is a prescription medicine with possible side effects, so it should be started and followed by a doctor.
Full entry: Post-Finasteride Syndrome →What is minoxidil?
Minoxidil is an established medication for certain types of hair loss. It is a drug, not a hair oil, and the FDA-approved label says not to use it for sudden or patchy hair loss.
Full entry planned: MinoxidilWhat is post-finasteride syndrome?
Post-finasteride syndrome is a term for sexual, neuropsychiatric and physical symptoms that persist for at least three months after a man stops finasteride. A 2020 review concluded that studies so far can neither confirm nor refute it as a distinct disease.
Full entry: Post-Finasteride Syndrome →What is red light therapy for hair?
Red light therapy, or low-level light therapy (LLLT), is a non-invasive option for pattern hair loss. Clinical studies suggest it may improve hair density, but research does not prove it is consistently more effective than minoxidil.
Full entry: Red Light Therapy →What is spironolactone?
Spironolactone is a prescription water tablet that dermatologists use off-label for women with female pattern hair loss, because it blocks the effect of androgen hormones on the hair follicle.
Full entry: Spironolactone for Hair Loss →