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Less common side effects include diarrhea and fatigue

(Liu is on scientific advisory board of the University of Oxfords Jenner Institute, which developed AstraZenecas vaccine for COVID-19.) Had this to say in The Scientist

Since animal products are the richest sources of B12, B12 supplements are more commonly recommended for those who follow a vegan or vegetarian diet, as opposed to a Paleo diet

In addition to resistance to diet-induced obesity, the absence of HSL also protects against genetic obesity, based on the observation that mice homozygous for both HSL and leptin deficiency ( ob/ob ) are 26% lighter than ob/ob mice and this is reflected by a reduction in WAT mass [14]

That is the Gold Standard of scientific research: A good read when it comes to studies and journals is a book written by Ben Goldache titled Bad Pharma: How Medicine is Broken, And How We Can Fix It