In very lean individuals you can actually use insulin syringes to reach the depth of the muscles if you push hard enough on the skin
It's currently available for research purposes and through physician-supervised wellness clinics in many jurisdictions
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In todays world, its becoming more challenging to guarantee the quality of substances that we put in our body
doi: 10.1111/j.1365-2826.2009.01895.x
Options include: Fortified foods : Nutritional yeast, plant-based milk alternatives, breakfast cereals, and meat substitutes fortified with B12 (check labels for content) Supplements : Daily supplements of 10 mcg or weekly doses of 2,000 mcg ensure adequate intake, as recommended by the British Dietetic Association The body absorbs approximately 50% of a 12 mcg dose but only about 1% of a 1,000 mcg dose through passive diffusion