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B vitamin deficiencies can cause various symptoms, such as: tiredness weakness dizziness dry or itchy skin twitching tingling or pain in the hands and feet mood changes, such as depression or anxiety difficulty thinking, or brain fog impaired immune function If B vitamin deficiencies become severe, they can cause more serious symptoms, such as nerve damage or seizures

Two popular ways in which B12 levels can be restored to normal include: B12 injections Oral medications The method used is generally dependent on whether one has developed a nutritional deficiency or poorly absorbs the vitamin

This is why insulin, for example, must be injected

This has created a complex and evolving regulatory environment