Are hair strand tests hogwash?

[Curlewwoohoo]

Just that. For vitamin deficiencies.

No idea. Posting to fill in time before oven timer pings. Nail injuries take a.long time to grow out. Hair and nails are both keratin, and 'dead'. How long ago was the hair that is submitted for testing formed? It might work like tree rings: but you have to cut the tree down to get at the information. So : still no idea. Personally, I'd doubt it. Though I seem to recall toxicological tests of Napoleon's hair, long after his death, revealed something poisonous.

Pretty much, bunkum, yes. Especially if you dye or bleach your hair as that wrecks almost all deposits anyway.

Genuine hair testing is for checking for drug use, heavy metal ingestion and DNA in forensics etc, but even those are all limited.

Long but good and referenced article - https://quackwatch.org/related/hair-2/. A few years old now, but nothing's really changed.

Yes, total nonsense. It’s up there with homeopathy.

Lol @Gagagardener i love your reply. Hope dinner was good!

Yes, there was something on TV this morning debunking it. Think it was BBC1, wasn't really paying much attention tbh.

Surely, they could only see deficiencies at the time the hair started to grow?

Looked up Napoleon. Arsenic. @Curlewwoohoo Very nice, thank - though courtesy of M&S. Smokey spice fish bake. Treat because we've had bad colds.