I have a new character that is a vampire alchemist And he just got a large amount of garlic. Is it lethal to TES vampires? The game doesn't make much mention to it. Thx

Even in real life garlic don't bother Vampires. Garlic bother Vampires just as much as it does to humans.

In Skyrim wise, I don't think garlic bother Vampires. I think I was a Vampire Lord and it never bothered me. Don't quote me on it, been ages since I played as a VL.

In TES, it's a myth.

Vincenti in Oblivion commented on being allergic to them, but it's not universal. Nor was it lethal.

So, no. Feel free to eat all the garlics you want.

My vampire would chew on garlic, travel during the day, and stab himself with silver bolt.

He seems fine.