I don't know what is available where you are.
But if you can find methylcobalamin ...at least 1000mcg size...that would be a good start.
Stop taking it at least 3 days to a week before any testing.
Stand alone products are the only ones with high dose as a rule.
There are rare products now (but don't know if you have it where you are) called Metanx, which are high dose.
Take your B12 on an empty stomach with no food for at least an hour. Otherwise it won't be absorbed well. 50mcg in a mixture is not going to get you very far (if you have problems absorbing for any reason).
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Weezie looking at petunias 8.25.2017
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