If concentration is your primary concern, B12 shots for mental energy can be part of a broader focus plan covering sleep, hydration, and a protein-forward breakfast
The four forms (vitamins) of B12 are all deeply red colored crystals and water solutions, due to the color of the cobalt-corrin complex (biologically relevant enzyme, it is the "core" of vitamin B12)
Toxicity: non-toxic at doses exceeding daily allowance by 10,000 times
For B12 Deficiency If you have a vitamin B12 deficiency, the initial dose is usually 30mcg injected under the skin or into the muscle every day for between 5 and 10 days to boost levels of B12 quickly
Dairy products such as fish, milk, poultry, eggs, and meat are the main sources of B12