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doi: 10.1053/j.gastro.2004.04.015 45 GuoSAl-SadiRSaidHMMaTY

That caveat matters, and we'll come back to it

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Fortified Plant-Based Foods : Many cereals, plant-based milks and nutritional yeast are enriched with synthetic B12, making them a practical alternative for those avoiding animal products

Studies have demonstrated measurable lipolytic activity in adipose tissue while confirming the absence of significant changes in blood glucose, insulin sensitivity, or IGF-1 levels, validating its utility as a targeted research tool for studying fat metabolism pathways independently of growth axis effects

No way to know how many of those patients would have improved anyway, or whether the act of receiving an injection itself a well-documented phenomenon called the placebo effect accounted for some or all of the improvement