Ok, so after you take your vitamins does your urine turn to a bright yellow? Of course it does, you want to know why? because your body doesn't need those vitamins and is simply flushing them out of your system and into the sewer.
If you eat right there is no need for any vitamins whatsoever UNLESS your doctor says you have a deficiency in some sort of vitamin and suggest you take that. Vitamins are not regulated by any branch of the federal government so they'll make all sorts of wonderful claims making you believe you'll perform better, your sex life will be better, you'll live to be 112 just ask old Frank who claims he's been taking the same vitamins for 100 years and watch him lift a VW Beetle off the ground in the front! Or you're memory will be better and now you can remember being in your mommy's tummy. Ok next please. In other words DON'T WASTE YOUR MONEY by feeding the sewer system.
https://www.webmd.com/vitamins-and-...erts-dont-waste-your-money-on-multivitamins#1
https://www.livescience.com/42001-case-is-closed-multivitamins-are-a-waste-of-money-doctors-say.html
I knew two ladies who were registered health nuts, they had several degrees in nutrition and exercise, they exercised everyday (they did look good!), they spent about $250 a month on various health vitamins, minerals, herbs, other supplements, eating only certain foods and no red meat and other foods, and they all said eating this and taking that will prevent cancer and heart disease...except both died from cancer before their mid 50's! I've only on rare occasion have taken a cheap store brand multivitamin and never felt anything better or worse, so I stopped.
http://www.bbc.com/future/story/20161208-why-vitamin-supplements-could-kill-you
One of those ladies above that I mentioned worked for GNC and had numerous degrees and certificates and was a strict vegan.
There is no science that supports the claims of the health industry makes, it's simply snake oil, any perceived benefit you think you feel is simply psychosomatic.
https://www.hopkinsmedicine.org/hea.../is-there-really-any-benefit-to-multivitamins
Some older adults do not take in naturally occuring vit B12 and thus will have certain issues associated with that so doctors will give them a B12 shot ever so often to boost the levels up; also for people who do not go into the sun may lack Vit D and a doctor will test for that and suggest a D supplement; and Folic Acid is often prescribed to pregnant women; and Iron for people with iron poor blood but again the doctor must keep close tabs on your body's levels are too much can be very bad; but medically, that's the only vits that are ever recommended by a doctor!
https://www.today.com/health/vitamin-pills-supplements-don-t-help-most-people-doctors-say-t122663
Again, it's all about having a healthy diet, I guess if you eat nothing but McDonalds day in and day out you might need some help...like learning how to cook at home!! Also those on a strict vegan diet do lack in essential supplements which is why strict vegan diets aren't not good for you.
And there is no regulatory agency looking over the health industry so they'll say anything to make a dollar, actually they make a billions of dollars a year, but with no regulations they are free to say whatever they want, heck I wouldn't be surprised if a lot the vitamins you all take have nothing but sugar and some sour stuff mixed in because there is nothing that regulates what they put in a pill except the FDA insists that it be safe, and sugar and something sour is safe.
http://www.ahchealthenews.com/2013/08/12/are-vitamins-supplements-always-necessary-or-healthy/
Your body cannot absorb synthetic or extracted natural (if they can actually prove they are from a natural source, which no company can prove that so I have my doubts) vitamins in a pill form which is why your urine turns a bright yellow, whereas when eating food rich in vitamins it doesn't because the body is able to extract the vitamins from the food better, and since if you do eat right any vitamins you do take the body says it doesn't need anything extra so again it's rejected out the urine stream.