Prescription agents (e.g., semaglutide) : Stronger clinical evidence, FDA-regulated, but may carry more systemic side effects
Fatigue and Headaches : A few individuals report feeling tired or experiencing headaches after receiving the injections, although these symptoms are typically transient
B12 injections have become one of the most widely marketed treatments at med spas across the United States, driven by consumer demand for quick energy boosts, anti-aging support, and metabolism enhancement
By contrast, giving B to people with normal levels does not boost energy or metabolism beyond normal
Current medical evidence shows that individuals with normal B12 levels are unlikely to experience increased energy or reduced fatigue from extra B12 supplementation, as the body simply excretes what it does not need
This often occurs in smokers, people with metabolic disease, heavy alcohol drinkers, as a side effect of certain prescription drugs, rheumatoid arthritis and impaired thyroid function