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Description
"A systematic review of microbiome changes and impact of probiotic supplementation in children and adolescents with neuropsychiatric disorders."

Each has its own features

The distinction matters because treatment differs: intrinsic factor deficiency requires parenteral B12, whilst dietary deficiency often responds to oral supplementation or dietary modification
Some notice effects even sooner

2) it induces higher folate concentration within a shorter time in the blood stream, so it works faster and takes effect earlier
