standard b12 injection dose Compounded Cyanocobalamin (Vitamin B12) Vitamin B12 Recommendations: Updated -

Inhibiting this pathway leads to enhanced fat metabolism and improved glucose tolerance. Hong et al., Nature Medicine Biohackers and Longevity Enthusiasts Because it increases NAD a key coenzyme in energy metabolism, DNA repair, and aging 5-Amino-1MQ may appeal to those looking to extend healthspan, improve cellular resilience, and combat age-related decline

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Maternal requirements for vitamin B12 increase during pregnancy

Vitamin B12 (Methylcobalamin) : Boosts energy and supports nerve function

That is a conversation to have with your GP or a specialist haematologist, not a reason to add a private injection on top of an NHS schedule without telling either provider