Vitamin B12 supplementation is available in several forms, including oral tablets, sublingual (dissolved under the tongue) preparations, nasal sprays, and intramuscular injections (commonly known as B12 shots)
Adverse reaction 1) If overdose, the following adverse reactions may occur: Headache, asthenia, fatigue, muscle pain, Loss of appetite, weight loss, growth disorder, nausea, vomiting, constipation, diarrhea, polydipsia, polyuria, dehydration, high blood pressure, calcium oxalate stones, tissue calcification, kidney disease, vascular disease, and kidney failure
If you have digestive problems or anemia, you may struggle to absorb vitamins in the usual way through your small intestine
"Microbial production of vitamin B 12 by methanol utilizing strain of Pseudomonas species"
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!Chemotherapy drugs - GHK-Cu promotes cell growth and blood vessel formation, which could theoretically interfere with cancer treatment