Pickart has a scale of strength of his coppers
Scientific References Bacteriostatic Water for Injection SmPC (EMC product 6655)
Cordaro M, Siracusa R, Fusco R et al (2021) Involvements of hyperhomocysteinemia in neurological disorders
Signs of a B12 deficiency include: pain tingling difficulty walking uncontrollable muscle movements confusion, forgetfulness, or memory loss changes in mental state or mood changes in smell or taste vision problems diarrhea weight loss glossitis, aka a painful, smooth, and red tongue If you have any of the above symptoms, talk with a doc
This works out to 1/8 to 1/2 teaspoon of the cream per day, or three to 10 drops of it in oil form, or one pump full with the metered pump dispensing top