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This is because the effectiveness of benzyl alcohol as a preservative loses its potency with repeat use and exposure
Regular injections, as prescribed by a healthcare provider, can help maintain consistent Vitamin B12 levels and optimize the benefits
These findings are supported by those of Zhang and co-workers (see above Zhang etal, 2016) who found significanty lower levels of Methyl B12 in the brains of children with autism
Some researchers run this level for 46 week blasts, then drop back to 300mcg maintenance
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