No, bright yellow urine doesn't mean that you're not absorbing your vitamins. Any vitamin that's mixing with your pee is a water-soluble vitamin, and any amount of it that your body doesn't need simply gets excreted through the urine. That means your body is taking in what it needs.
High-dose vitamins can turn your pee a bright, almost neon-yellow color. The most common culprit is vitamin B2, also known as riboflavin, which is found in most multivitamins. The neon color in pee is just a harmless sign that you're taking more than your body needs, and the excess is mixing with your pee.
Riboflavin is a member of the B family of vitamins (B complex). It's a water-soluble vitamin. Excess amounts are excreted through your kidneys. It makes the urine bright yellow.
When taking a supplement, it's important not to take too much. Taking 200mg or more a day of vitamin B6 [LK2] can lead to a loss of feeling in the arms and legs known as peripheral neuropathy. This will usually improve once you stop taking the supplements.
Riboflavin may cause urine to have a more yellow color than normal, especially if large doses are taken. This is to be expected and is no cause for alarm. Usually, however, riboflavin does not cause any side effects.
The common forms of vitamin B include vitamin B1 (thiamine), B2 (riboflavin), B3 (niacin), B6 (pyridoxine) and B12 (cyanocobalamin). Except for niacin (when given in high doses), there is no evidence that the other B vitamins, in physiologic or even super-physiologic high doses cause liver injury or jaundice.
After administration, riboflavin is rapidly absorbed (tmax 1.4–2 hours) and is eliminated in urine, with more than 91% of the total excretion of riboflavin taking place during the first 24 hours (Zempleni et al., 1996), making it a good candidate for the measurement of compliance using a once per day dosing.
Riboflavin is generally considered safe, even at high doses. Riboflavin does not seem to cause any serious side effects. Very high doses may cause: Itching.
Riboflavin may cause urine to have a more yellow color than normal, especially if large doses are taken. This is to be expected and is no cause for alarm. Usually, however, riboflavin does not cause any side effects.
Foods that are particularly rich in riboflavin include eggs, organ meats (kidneys and liver), lean meats, and milk [2,4]. Some vegetables also contain riboflavin. Grains and cereals are fortified with riboflavin in the United States and many other countries [4].
If your pee looks like a neon billboard, blame B vitamins, Miller says. Riboflavin (B2) is naturally fluorescent when exposed to UV light. It might be jarring to see, but it's nothing to worry about.
Any excess of water-soluble vitamins, like the Vitamin B complex or Vitamin C, are excreted through the urination process. Many B vitamins and Vitamin C can be found in vegetables (like leafy greens and other green vegetables) and fruits (like citrus fruits).
“Digestion slows down during sleep, so taking your nutrient supplement late at night would not be associated with an efficient absorption.” Neil Levin, a clinical nutritionist at NOW Foods, agrees that morning is best for multivitamins and any B vitamins.
Vitamin B1 (thiamine): Thiamine is good for red, irritated, acne-prone or dry skin. It also improves the appearance of fine lines and wrinkles. Vitamin B2 (riboflavin): B2 can help improve skin tone, make skin more radiant and balance natural oils, making these great vitamins for dry skin or acne.
Interactions between your drugs. No interactions were found between Vitamin B12 and Vitamin D3. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.
Vitamin B2 is therefore an important factor in preventing insufficient recovery during sleep and counteracting the resulting tiredness and feelings of tiredness during the day. It therefore has a positive effect on sleep quality and also improves sleep effectiveness.
Why do B vitamins make your urine neon yellow? B vitamins are water-soluble, so any excess gets released through the urine. Because vitamin B2 (riboflavin) has a fluorescent hue, the excess, when mixed with the urine, can produce that neon yellow color.
Riboflavin is destroyed by exposure to light. Foods with riboflavin should not be stored in clear containers that are exposed to light.