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Headaches or dizziness: Mild neurological side effects can occur, especially in those sensitive to peptides affecting neurotransmitter systems
Additionally, there may be some mental health benefits since some people have reported better mental clarity
Many cheap supplements use synthetic fillers or "proprietary blends" that hide the true amount of active ingredients
"Carnitine." National Institutes of Health-Office of Dietary Supplements
Conditions like pernicious anaemia (an autoimmune condition affecting a protein called intrinsic factor vital for B12 absorption), stomach issues (such as from reduced stomach acid or certain medications like proton pump inhibitors), intestinal disorders (like Crohns disease or coeliac disease), or even surgical removal of parts of the small intestine (e.g., gastric bypass surgery) can prevent proper absorption
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