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Anastassov Y, Chipkov C
Products promoted as supplements may still fall under drug laws when sellers claim they can treat disease or change how the body functions
However, these drugs can cause gastrointestinal side effects, such as nausea and diarrhoea
Vitamin B12 is not present in foods of plant origin, but is abundant in foods of animal origin
Retinol supplementation is often discouraged due to toxicity concerns, with the WHO recommending it only where deficiency is a known public health issue [15]
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