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Those of us who are deficient and start on a vitamin D supplement usually take five to six weeks to reach the recommended level of vitamin D. If you're in doubt, it's always best to have a chat with your GP who might arrange a blood test. The B vitamins and vitamin C are all water soluble.
Vitamin B12 is also said to help some sleep disorders, some mental disorders and slow the progression of dementia in the elderly. Supplement makers also say vitamin B12 supplements can help treat conditions such as Lyme disease, gum disease, some skin infections, liver disease and kidney disease. vitamin B12 deficiency has a wide range of symptoms. Someone with low vitamin B12 may lose their appetite, lose weight or feel tired and weak. Depression, poor memory and trouble thinking can all be symptoms of a vitamin B12 deficiency.