B12 injections are an intramuscular shot of Vitamin B12 (typically in the form of cyanocobalamin or methylcobalamin) that delivers the vitamin directly into the bloodstream
Is it still okay to use

Compliant with UKCA, EP, and EU-GMP international standards Core efficacy Multi-effects in one Relieve arthritis pain, eliminate joint inflammation, and restore joint flexibility Promote joint tissue repair and regeneration, enhance elasticity and mobility Promote blood circulation, and help the comprehensive repair of joints Professional certification Clinical verification Proven effectiveness by the Clinical Medical Research Center Approved by MHRA certification, and jointly recommended by professional organizations Developed and manufactured by HONXI, jointly recommended by orthopedic experts Safety guarantee Trustworthy Pure natural ingredients, no side effects, no residue No harmful ingredients, zero hormones, zero stimulation Suitable for all skin types and age groups, sensitive skin can be used No animal testing, guarding every conscience HONXI BPC-157 Joint Healing Cream contains seven proven powerful ingredients that have been used by millions of users worldwide to effectively treat arthritis-related conditions BPC-157BPC-157 balances the levels of pro-inflammatory and anti-inflammatory factors, reducing inflammation while avoiding excessive immune responses

Since then, several clinical studies have shown its safe and effective use - but the pharmacuetical companies have decided not to (yet) pursue FDA-Approval (likely because each new FDA-Approval costs several million dollars to go through the process, and because there are a good deal of drugs used off-label in the way tranexamic acid is for melasma, especially when the drug has a long history of safety and efficacy, as is in this case)