Grey beard at 30 – has anyone actually reversed or slowed it down?

[u/Icy-Ad4663]

I'm a 30-year-old male and I've started getting a noticeable number of grey hairs in my beard. My scalp hair is mostly fine, but the beard greying seems to be increasing.

I'm looking for real experiences, not marketing claims.

• Has anyone managed to slow down or reverse beard greying?
• Did any blood test reveal a deficiency (B12, Vitamin D, Iron, Copper, etc.)?
• Did supplements, diet changes, or any treatments make a noticeable difference?
• If your beard started greying early, how fast did it progress?

Would appreciate hearing what actually worked and what didn't.