Ingredient profile

Hair-loss treatment · best used AM or PM

• Minoxidil with tretinoin, rosemary oil or derma roller needs care: start slowly or alternate days.
• Minoxidil sits happily next to finasteride.

1

Mixes freely1

Needs timing0

Needs care3

Not together0

What it does

Minoxidil is a topical hair-loss treatment sold without a prescription as a 2% solution and as 5% solution and foam, approved for pattern hair loss in men and women. It is a prodrug: enzymes in the follicle convert it to minoxidil sulfate, the active form. It works through several routes, including widening blood vessels and lengthening the growth phase of hair. Only about 1.4% of a topical dose is absorbed through the skin.^[1]

Strengths

• A study found tretinoin increased percutaneous absorption of minoxidil, which is why some combination formulas exist.^[4]
• A trial compared 5% minoxidil alone with 5% minoxidil plus 0.01% tretinoin applied once daily.^[5]
• A review found topical minoxidil regrows hair at both the crown and the front and sides of the scalp.^[1]
• In a five-year study, 2% minoxidil gave peak growth in men at year one, with a gradual decline after.^[1]

Who it suits

People with gradual, inherited pattern hair loss on the scalp who want an over-the-counter option and are ready to use it long term.

Who should skip

Not for sudden, patchy or unexplained hair loss, under 18s, or a red, irritated or infected scalp, and ask a doctor first if you have heart disease. The label warns it may be harmful in pregnancy or breastfeeding. It is dangerous to cats and dogs: in poison center data, drops or licks were enough to cause illness, and 13% of cats that fell ill died.^[2]

How to start

1. Apply 1 mL with the dropper twice a day directly onto a dry scalp in the thinning area. Using more, or more often, will not improve results. Let it dry before styling and wash your hands afterward.^[2]
2. Results may show at two months, but some people need at least four months. Regrowth only lasts while you keep using it, and hair loss starts again when you stop.^[2]
3. Some extra shedding in the first weeks is common as resting hairs are pushed out by new growth, so do not quit during this phase.
4. Stop and ask a doctor if you get chest pain, a rapid heartbeat, faintness or dizziness, sudden weight gain, swollen hands or feet, scalp redness, or unwanted facial hair, or if nothing regrows after four months.^[2]
5. Cats are most often exposed by licking the owner or the pillowcase, or by a splash during application. Let it dry fully, keep pets off treated hair and bedding, and store the bottle out of reach.^[3]
6. For men, oral finasteride is the usual partner, since it targets the hormone side of pattern loss while minoxidil drives growth.^[6]
7. Tretinoin raises how much minoxidil gets through the skin, which is the idea behind combination formulas, but it can also irritate the scalp.^[4]
8. Microneedling and rosemary oil come up often as add-ons. Leave a gap after needling, because freshly needled skin absorbs much more and stings.
9. Low-dose oral minoxidil is a separate, off-label prescription option with its own risks, discussed with a doctor rather than swapped in at home.^[1]
10. The 5% men's label says it is not intended for frontal baldness or a receding hairline, and asks you not to use it with other scalp medicines or on a red, inflamed scalp. A dermatologist can confirm the cause first.^[2]
11. Stronger is not always better. A review found the 5% solution and foam were not significantly different in efficacy from the 2% solution, and the foam skips the propylene glycol in many solutions that can itch.^[1]
12. Response varies because follicles must convert minoxidil to its active sulfate form, and people with higher levels of that enzyme tend to respond better.^[1]
13. The solution is flammable, so keep it away from flames and hair dryers until dry. Do not apply it to other parts of the body, and rinse the eyes with plenty of water if it splashes.^[2]
14. Unwanted facial hair usually comes from drips or a damp pillow, so apply carefully and at least a couple of hours before bed.^[2]

Pairing grid

Sources