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If you dont have enough healthy red blood cells, your tissues and organs dont get sufficient oxygen, leading to fatigue and weakness a condition known as B12 deficiency anaemia

Vitamin B12 supplements are usually safe

While some sources may offer lower prices, especially online or internationally, you should be sure to do thorough research and exercise caution

Unlike food or oral supplements, vitamin B12 injectionswhich are injected under the skin or directly into the musclebypass your gut and go directly into your bloodstream to help counteract the effects of a deficiency, says Foxx

After each use, ensure the rubber stopper is clean and the cap is on, then return the vial to refrigerated storage

Results may vary based on your initial deficiency level