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The doses were higher than GLP-1 drugs are run at clinically

Semaglutide, for example, is structurally modified to resist DPP-4 degradation and bind to albumin in the blood, extending its half-life to approximately 7 days

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In practice, that often means: Your provider may be comfortable starting a standard daily vitamin D supplement without ordering labs first if: You are generally healthy You are taking a modest daily dose in the typical range You do not have bone disease or other conditions that raise concern Your provider is more likely to want vitamin D blood work if: You have a history of osteoporosis or frequent fractures You have conditions that affect vitamin absorption You are on medicines that change vitamin D or calcium metabolism You are considering higher dose or long term vitamin D plans beyond typical daily intake Vitamin B12 Vitamin B12 is crucial for red blood cell formation, nerve health and DNA production