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How it works: Your thymus gland (located behind your breastbone) naturally produces Thymosin Alpha 1 to train immune cells
[7] [4] Folate levels should be checked before or alongside B12 treatment
Kevin Jones, MD, Board-Certified Obesity Medicine Physician, Medical Director, Flow Wellness Last updated: July 2026 Lets be honestGLP-1 shots like tirzepatide can do great things for your health, but figuring out your dose can be confusing
While the timeline varies for each person, it typically takes a few days or weeks before vitamin B12 levels improve, reducing symptoms such as extreme tiredness or lack of energy
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![Mechanism of action of GLP-1 [25]](https://www.researchgate.net/publication/256289222/figure/fig1/AS:614177232142337@1523442671231/Mechanism-of-action-of-GLP-1-25.png)
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