Vitamin B complex is a group of B vitamins. All these vitamins are soluble in water. Water soluble Vitamins get dissolved in water. Therefore, any excess that you take will be expelled through the urine. Certain illnesses , Alcohol and or Pregnancy may deplete Vitamin B complex in the body. Diet alone may not be adequate. Please take supplements.

Benefits of Vitamin B complex
Improve Memory
Reduce Risk for Disease
Help in Reducing Weight
Reduce Migraine Headaches
Improve Skin, Hair and Nails

Effects of Excess Vitamin in the Body
Rashes
Dizziness
Difficulty in Breathing
Itching or swelling (especially on the face/tongue/throat)

Effects of deficiency Of Vitamin B Complex
Pale skin
Sore Tongue
Weakness and Tiredness
Diarrhea or Constipation
Rapid heartbeat and breathing
Mood changes or Depression
Stomach upset and Weight loss
Tingling or numbness in Fingers and Toes
Memory loss, Disorientation, and Confusion
Easy Bruising or Bleeding, including Bleeding Gums