Thats because folate is needed for a baby to develop normally particularly for nervous system development, especially during the first few weeks of pregnancy
If you are weighing up B12 injections, the most useful anchor is the standard NHS schedule, because it is built around how the body actually uses B12
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Single Injection: 55 | Course of 6: 200 FAQs Can I overdose with B12 injections
Most manage well with fortified foods or a supplement, and the Vegan Society sets out simple oral options that work for the majority without any injection at all
For instance, hydroxycobalamin is stored in the body longer than cyanocobalamin, reducing the need for frequent injections