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Conclusion: We have shown that illicit drugs used in PCT may be substituted, adulterated, or contain no active ingredients

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Yes, there are specialized B12 injections like Tiaminal B12

Uses of Methylcobalamin Injection Treatment of Vitamin B12 deficiency anemia (megaloblastic anemia) Management of peripheral neuropathy, including diabetic neuropathy Support in neurological disorders such as subacute combined degeneration of the spinal cord Adjunct therapy in neuralgia and nerve injury recovery Prevention of Vitamin B12 deficiency in malabsorption syndromes How Does Methylcobalamin Injection Work

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