I had mostly convinced myself it was stress. Then I stumbled onto a thread of women describing the exact same thing — the same timeline, the same shedding, the same desperate attempts to blame something else.
One of them had linked a study.
I clicked it. And everything I was trying not to believe started making a lot more sense.
Here is what I found out.
When you take 5-HTP, your body converts it into serotonin. That's the whole point — more serotonin means better mood, less anxiety, better sleep. And it works. That part is real.
But serotonin does something else that nobody talks about.
It causes your blood vessels to tighten.
Think of your blood vessels like a garden hose. When serotonin levels spike, it's like someone is slowly squeezing that hose. The water can still get through — but not nearly as much.
Now imagine that hose is feeding your hair follicles.
Your follicles are some of the most demanding cells in your entire body. They need a constant supply of oxygen and nutrients delivered through your blood to stay healthy and keep growing. When that blood flow gets restricted, they don't get what they need.
And when your follicles are starved of oxygen — they panic.
That panic has a name. It's called oxidative stress. It's basically your follicles sending out a distress signal — they're not getting what they need, they're damaged, and they're struggling to survive.
When a follicle is under that kind of stress, it does one thing to protect itself.
It shuts down.
It stops growing hair and switches into survival mode. The technical term is telogen effluvium — your follicles abandoning the growth phase and entering the shedding phase all at once.
And here is the part that makes this so easy to miss.
It doesn't happen overnight.
The damage builds quietly for months before you ever see it. By the time you notice the shedding in the shower, the thinning at your temples, the hair on your pillow — the process has already been happening inside your scalp for a long time.
That's why so many women blame everything else first. The timing is so delayed that by the time the hair falls out, the cause feels completely disconnected from what started it.
It isn't genetic. It isn't stress. It isn't your diet.
It's your blood vessels squeezing tight every single time you take your supplement — and your follicles quietly paying the price.
I went back to the studies.