can vitamin b12 injection cause fever Doctor explains clinical signs of (cobalamin) deficiency | Glossitis, mouth ulcers etc Vitamin B12 shots: Uses, benefits,

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It can also be caused due to poor diet, malnutrition and following a strict vegetarian diet

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All needles are manufactured to strict quality standards using computerized grinding and 100% visual camera inspection to promote sharp, consistent, and high-quality needles in FDA-inspected ISO 13485 certified facilities which utilize good manufacturing practices per USFDA standards

Conversely, if you are a vegetarian or vegan, you might need to rely more on B12 shots or supplements to maintain adequate B12 levels