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Painkillers: Can take up to an hour to start working
In addition to impacting the speed of absorption of oral supplements, the digestive process also affects the extent of absorption, with 40%-50% of low-dose B12 vitamins being absorbable
You can also take a vitamin B12 supplement, but make sure you stick to the good stuff
Systemic reach
Common Side Effects Following B12 Injections B12 injections, whilst generally well-tolerated, can produce side effects that vary between individuals
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