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Dietary Deficiency: Vegans and vegetarians are at higher risk since B12 is mainly found in animal products (meat, fish, eggs, dairy)

Intranasal administration bypasses the blood-brain barrier via the olfactory nerve and trigeminal pathways, allowing direct delivery to the CNS within minutes

Tiredness, stress, ill-health, poor or limited diet will all reduce this absorption further. For some people, taking a vitamin B12 supplement is one of the easiest ways to maintain healthy levels