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An 8-week cycle typically pairs with a 4-week break
(PubMed) Zuin M, Cervellati C, Brombo G, Trentini A, Roncon L, Zuliani G
Pregnancy If you are pregnant or breastfeeding, you may not be suitable for B12 injections, but it is still safe for you and your baby if you take a limited dose of B12 orally
From the respiratory system: respiratory arrest, respiratory depression, shortness of breath
UK guidance notes that B shots improve energy and prevent nerve damage in deficient patients
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