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However, as they work in part by significantly reducing a person's appetite, this can introduce "nutritional risks if patients are not intentional about what they eat," Dr Fatima Cody Stanford, a professor of medicine and pediatrics at Harvard University, told Newsweek

In severe cases, the body may struggle to absorb enough of the vitamin from oral sources leading to continued symptoms of deficiency

Alternatively you can purchase some over the counter from pharmacies and supermarkets