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Some of the key signs of low B12 to look out for include: Muscle weakness Numbness and tingling in the hands and feet Difficulty walking Nausea Weight loss Irritability Fatigue Rapid heart rate (7) One of the other tell-tale symptoms of a B12 deficiency is constant fatigue or being tired all the time, which can also manifest as sleep disturbances, including insomnia in some people, often requiring sleep medications

Many supplements use cyanocobalamin the cheapest and most common form of B12 but this synthetic version must be converted by the liver before the body can actually use it

Iron injections, which are used to treat certain types of anemia, can also cause black urine, but oral iron does not

These secondary infections can take such a deep hold over your body because sickness depletes you of fluids, vitamins, and nutrients the essentials your immune system needs