Nobody should try to inject the vitamin B12 solution on their own, and its best to have it done by an expert or professional
L.XieZ.LevittP
I wouldnt count on sources like seaweed, spirulina, or soil. I hear people that likely do need to supplement with B12 say that theyre OK because they eat foods that may include B12, but they can be unreliable sources, such as sea vegetables or nutritional yeast, says Ginger Hultin, MS, RDN, CSO, a lifelong vegetarian, chair of the VNDPG, and spokesperson for the Academy
Lancet Diabetes Endocrinol (2019) 7(6):427
Expression and Distribution of GPX3 in Cells GPX3 is a selenoprotein antioxidant enzyme synthesized primarily in the kidneys, from where it is transported into the systemic circulation
They are concerned about uncontrolled release and unknown purity