Can you take centrum multivitamin twice today if you are very active individual and it takes a lot of work for you to walk into every day activities?

Yes, however... Centrum doesn't have levels of vitamins and minerals that would be toxic to take 2x/day but it does have toxic additives including aluminum, artificial colors and poor forms of vitamins like synthetic E that may be toxic. You can do FAR better by taking a high quality mulitivit. such as UltraNutrient by Pure Encapsulations or Ultra Preventive X by Douglas Labs. See http://tinyurl.com/mzrkbx8.