im sites for b12 injection Intramuscular Deltoid Safe B12 Injection Guide at
Description
[28] Pregnant and breastfeeding women are generally advised not to use Lipo-B injections as well (see above discussion in Pregnancy section)

For example, if the current frequency is 3-monthly then change to 6-monthly
This is real but subtle
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Once B12 levels improve and you are no longer deficient, your treatment may be switched to supplements
