Hair - Evidence
Every hair treatment looks like it is failing at week six
The shed that makes people quit minoxidil is often the drug working. Here is the timeline nobody hands you at the pharmacy counter.
01 Why it gets worse before it gets better
Hair grows in cycles, and at any moment your scalp holds follicles in several different phases at once. Treatments that work by pushing resting follicles back into active growth have to end the resting phase first. Ending it means the old hair, which has been sitting in place doing nothing, finally lets go.
From the outside this is indistinguishable from getting worse. More hair in the drain, more on the pillow, at exactly the moment you were hoping for the opposite. The people most likely to quit are the people for whom the drug is doing precisely what it is supposed to do.
This is not a reason to persist with something that is genuinely not working. It is a reason not to judge in week six.
02 The honest timeline
| Weeks 2-8 | Shedding may increase. Expected. Not evidence of failure. |
|---|---|
| Weeks 8-12 | Shedding settles toward baseline. Still too early to judge density. |
| Weeks 12-16 | The first honest read. Compare photographs, not impressions. |
| Month 6+ | Where most of the visible benefit shows up in trials. |
The discipline that makes this work is boring and non-negotiable: one variable. If you start a topical, change your shampoo and begin a supplement in the same month, you will reach week sixteen with a result you cannot attribute to anything.
The short version
- An increase in shedding in the first eight weeks is expected on treatments that shift follicles into a new growth phase.
- Twelve weeks is the earliest honest read. Sixteen is better.
- Change one variable at a time or you will learn nothing from four months of your life.
Sources
- Transepidermal water loss: the signal for recovery of barrier structure and function - Journal of Lipid Research, 1989preclinical