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Were the Manufacturer: Because we produce in-house, we control purity, potency, and compliance instead of reselling from anonymous overseas labs

The more recent reaction may be due to the rate at which your cells are metabolising the B12 that is in your system

Your symptoms alone suggest that this might be a useful test to ask for (it won't given a diagnosis but if raised, will indicate that further testing is necessary)
Always consult with your provider before starting treatment
