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If you have autoimmune conditions, digestive absorption issues, and are on diets such as veganism and vegetarianism you are at risk of having B12 deficiency

Homeostasis model assessment: Insulin resistance and -cell function from fasting plasma glucose and insulin concentrations in man

GraphPad Software, San Diego, CA), a two- and three-way (repeated-measures) ANOVA, with post hoc Bonferroni t tests, was used (factors were the compound dose and sex for two-way ANOVA and test compound treatment, the presence or absence of WAY 100635, and sex for three-way ANOVA)

And among the different types, marine collagen, sourced from fish skin and scales, is the purest and most bioavailable

Biancatelli RMLC, Berrill M, Mohammed YH, Marik PE