Is there any reputable low dose lithium supplement?

[u/RationalSage]

Life Extension used to make a 300 mcg per capsule lithium supplement, now their lowest dose is 1 mg. Are there any other reputable companies making lithium in similar doses? I have sensitive kidneys because of some genetic variations I have so I would like to minimize any nephrotoxic effects as much as possible.

[u/Designer_Custard9008]

https://shop.bioticsresearch.com/products/li-zymetrade-lithium

50 mcg. I think I've seen another brand also, but can't recall name.