Why Do Vitamins Make Urine Bright Yellow


Why Do Vitamins Make Urine Bright Yellow If you’ve ever taken a daily multivitamin
you too might have noticed your urine turning a bright yellow-ish color. Take your vitamins and eat some asparagus
and you might just think you’re dying the next time you pee! What’s happening is that urine will turn
a bright, sometimes neon, yellow in response to excess riboflavin. Riboflavin, also known as vitamin B2, is a
common ingredient in almost all multi-vitamins. It was first discovered in 1872, when chemist
Alexander Wynter Blyth noticed a pigment in milk that was yellow-green. In 1879, it was reported as lactochrome and
lactoflavin. It wasn’t until the 1930s that the substance
giving off a yellow pigment was characterized as riboflavin. (The “flavin” portion coming from the
Latin word “flavus”, meaning “yellow” or “blonde”.) So why does riboflavin give off a yellowish
color? Like almost anything that has color, it all
comes down to light absorption. Light, in general, is merely electromagnetic
radiation. This radiation comes to us in a waveform and
is classified by its wavelength. Shorter wavelengths come to us in the form
of x-rays and ultraviolet light. Longer wavelengths come to us in the form
of things like microwaves and radio waves. The light we can see is actually only a very
narrow band of wavelength between 400-700 nanometers in length. The color is classified by the length. For example, 400-500nm will appear blue, and
600-700nm will appear red. The colors we see are a result of the wavelengths
not absorbed by the material. So if a material absorbs light in the 400-500nm
range (blue) then the color we will perceive is in the 500-700nm range (greens, yellows
and reds). Riboflavin, specifically, absorbs light strongly
in the 260-370nm range. While this falls outside of the light we can
see with our eyes, it’s also Riboflavin’s ability to absorb light at 450nm (the blues)
that give it its distinctive yellowish color. So why does it turn pee yellow? The answer is simply how the body gets rid
of excess. Several studies have shown that approximately
50% of all excess riboflavin gets excreted in the urine. Those same studies show that the maximum amount
that can be absorbed in a single dose was about 27mg, with half of that being absorbed
in the first 1.1 hours. Given that the recommended adult daily intake
of riboflavin is between 1-1.6mg per day and some common doses of riboflavin in multivitamins
(that I could find) are 25, 50, and 100 mg, it’s easy to see that excess amounts can
be easily attained. The result is a nice color to your urine that,
if you’re a hypochondriac, may make you think you’re dying. As a doctor friend of mine remarked when I
was discussing this with him and excessive amounts of unneeded vitamins Americans buy
every year, “Americans have the most expensive urine in the world. It’s like flushing money down the drain.”

39 thoughts on “Why Do Vitamins Make Urine Bright Yellow

  1. I have a chronic kidney problem and so I drink a LOT of water every day. "They" say if you are properly hydrated, your urine should be colorless, but mine is always pale yellow, and that worried me. Ahah! You have probably explained it. Time to discontinue vitamins for a week and test the theory.

  2. Simon, I've taken to watching the videos you do, with captions switched on!
    It's nice to see that youtube gets pretty much everything spot on with your superb diction skills!

  3. So in other words, vitamins are a worthless investment as they merely pass through the body and expelled via urination.
    It's better to eat and drink vitamin rich foods.

  4. usually the cause of yellow urine after a vitamin is caused my riboflavin or vitamin B2. This is a water soluble vitamin which is extracted through urine. All water soluble vitamins go through urine. Now, when you take fat soluble vitamins, you won't get yellow urine because these vitamins are usually always stored in the body like in the kidneys and liver. Due to the form of extraction from the body, the water soluble vitamins are alot more safer to take compared to fat soluble vitamins. reason being because water soluble vitamins are not stored in the body but extracted through urine so toxins won't build up in your organs overtime. This is just a low percentage risk with fat soluble vitamins. To reduce this risk, if you do want to take a fat soluble vitamins, you will need to drive plenty of water while taking them. Most multivitamins are fat soluble. Vitamin B complex (the 8 b vitamins) as well as vitamin C are considered water soluble. I'm in physician assistant who specialize in nutrition. Take care.

  5. Umm.. you Today I Found Out people should look into how ridiculous the recommended daily allowances for vitamins are… if your lucky, like I was, you'll also find some of the four natural (yet unpatentable, and therefore not allowed in the USA) cures for cancer… look into mega dosing with vitamin C. You'll find it fascinating… check out the Riordan Clinic in Kansas City… Really, you'll find literal cancer cures that are covered up while people die. I, for instance, am still dying because I have to pay for my treatment and I'm broke.

  6. hey. I'm taking silica, collagen, skin hair and nail supplements, which have all b vitamins, a vitamins, c and d, and more. I'm wondering. after I consume these. my pee turns yellow with 10-15 mins. and looks to be suds and tablet particles. I hope I'm not wasting them as they all cost me a lot of money. what do you think. thanks

  7. Hahahahahahah I cant stand how he says vitamins!! say vital! as in vital organs !! like important organs in your body, now say vital minerals !!!! as in vitamins!! they are vital minerals!! as in important minerals for the body to function!! thus Vitamins as in eye!!!…………. v "eye" tamins!! SAy it now with me folks!! ITs not how he's pronouncing it!! you pronounce the i like literally like a persons eye! not like as in the "it" i as in eye!! So vitamins ! !!!

  8. Know that you know how vitamins affect urine check out this video and find out the answer to the question- Do Cow Farts Really Significantly Contribute to Global Warming?:
    https://www.youtube.com/watch?v=Md2M2SKExmI

  9. Okay science dude you tell me brother why my urine went beyond just being neon yellow and glowed in the dark in the toilet when I turn the light off that is out of the norm odd but true in fact

  10. I once got an injection at a retina specialist that turned my urine neon yellow, which they told me was a side effect. I've never gotten that from taking a vitamin pill.

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