berberine or l carnitine for weight loss and supplement Spring Valley Berberine Dietary Supplement Vegetarian Capsules Metabolism Support 1200 mg, 40 Count Berberine by FinaFlex: All-Natural Weight
Description
Choline transporters may be another pathway into the brain, as demonstrated by Mn 2+ -dependent inhibition of choline uptake in rats

Yes B12 is water-soluble, which means your body uses what it needs and eliminates the rest naturally
In the role of a neuromodulator, ascorbate release is involved in the uptake or clearance of glutamate from the synapse after its release from the axon terminals

You cannot make B12 yourself