RU58841: How to Stop Hair Loss Without the Side Effects
If hair-loss pills put you off with their side effects, there's a way to block DHT at the scalp alone. Here's how RU58841 works.
Most hair loss comes down to one thing: a hormone called DHT slowly shrinking your follicles until they stop producing hair. If you want to keep your hair, you have to stop DHT reaching those follicles — and until recently, the only reliable way to do that was a daily pill.
The trouble with pills like finasteride is that they work on your whole body. They lower DHT everywhere, and for some people that brings side effects they'd rather not risk. It's a lot to take on when the problem you're trying to fix is only on your scalp.
A more targeted approach
RU58841 works differently. It's applied straight to the scalp, where it sits on the follicle's receptors and blocks DHT from binding — right where the thinning happens, and nowhere else. Think of it as a doorman on the one door that matters, rather than shutting down the whole street. You get the follicle protection without changing your body's hormones elsewhere.
It's the sensible first step, too. Before you try to grow new hair, you want to stop losing the hair you've already got. That's why we use a high 10% concentration — enough to hold the line properly.
Where you'll find it
Shield Wall (Woad) and Follicle Sanctuary (Aurora) both deliver the full 10% RU58841. Apply to a clean, dry scalp at night, massage in, and let it work while you sleep. Give it time — hair works on a slow cycle, so it's consistency over months, not days, where you'll see the shedding settle.
One important note: don't apply it at the same time as your copper peptide serum. The two need separating — more on that in our guide to splitting your scalp routine.
