With B complex, I would crush it (1/4 to 1/2 tablet) in some food you know he will eat, or you can put one of those pills in a liter of water. Chopped beef liver in small amounts is excellent for all B vitamins. Earlier you showed a bottle of B12, and that is not what you want to use.
The Poultry Cell that Kathy earlier recommended is also good to use since it has riboflavin.
The Poultry Cell that Kathy earlier recommended is also good to use since it has riboflavin.
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