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Individuals with certain health conditions, such as Lebers disease (a hereditary eye disease), should avoid B12 injections, as they can exacerbate symptoms
Though not dangerous, these symptoms can be uncomfortable and may persist with continued high-dose usage
Selenium levels, though less commonly tested, play important roles in antioxidant protection of hair follicles and may warrant evaluation in patients with concurrent autoimmune conditions or significant oxidative stress markers
The NHS delivers B12 injections through a nurse or doctor for exactly this reason
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