To help cut costs, I've purchased the less-expensive dosing of methylcobalamin from my preferred brand, at 1000mcg per tablet (sublingual). I've been tested for B12 repeatedly at doctors visits and the levels are always >2000. Is it safe to assume I can now back off of the 5000 mcg dosing since I always get this reading? Would 1000 mcg per day for life presumably work? I'm thinking it should...

I've been supplementing B12 now since 2012 for what it's worth

Thanks!