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B12 deficiency may occur due to poor diet, vegetarian/vegan lifestyle, malabsorption, aging, digestive disorders, or medications like metformin and PPIs

Do not replace prescribed medications with supplements without discussing it with your healthcare provider

The authors note that the decrease in leptin is less associated with satiety or subsequent energy intake, likely in part because leptin concentrations do not tend to change until several hours post food intake, with fluctuations more associated with longer-term regulation of energy balance. 4

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GHK-Cus effect on hair, based on published animal and in vitro work, is modest compared to FDA-approved options like minoxidil and finasteride