Vitamin B is not related to sexual health. Evion medicine you have mentioned is vitamin E and vitamin E once considered to improve sexual health. Now it has been shown that this vitamin also will not help sexual health activity. None of the vitamins have been proved has helpful in sexual health. Though vitamin B complex does not have any toxicity, high dose of vitamin A and vitamin D can produce toxicity. Vitamin A in very high doses can produce loss of appetite , skin rashes ,swelling of the body; it can also raise intra cranial tension and can produce headache. Very high dose of vitamin D can produce excessive calcium level in the blood, mental confusion,convulsion etc; rarely it can also produce kidney failure.