B2 in the form of riboflavin-5-phosphate and urine color

[Mylifesobright]

I have used regular B2 (between 50-100mg) on and off for the past 2 years. When I did, my urine was always much darker, which I know is considered normal. About 5 days ago I started taking coenzymated B2 (50mg), and I have noticed that the color of my urine is a normal color or pretty close. Could this be because my body was able to use it efficiently, instead of dumping what it couldn't use? Any thoughts would be appreciated.

 

[Hip]

What color is the riboflavin-5′-phosphate powder in the capsule?

 

[Mylifesobright]

What color is the riboflavin-5′-phosphate powder in the capsule?

The powder is an orangish color.

 

[Hip]

The powder is an orangish color.

So presumably the R5P would also color urine yellow if it were not absorbed by the body.

According to this article:

Among healthy individuals, approximately 95% of consumed dietary riboflavin is absorbed, up to a maximum of about 25 mg/day. At that point, absorption reaches a plateau and plasma concentrations are at their highest.

So if you are taking say 100 mg riboflavin tablets, 75 mg is going to be dumped in the urine anyway.

 

[Mylifesobright]

So presumably the R5P would also color urine yellow if it were not absorbed by the body.

According to this article:


So if you are taking say 100 mg riboflavin tablets, 75 mg is going to be dumped in the urine anyway.

Thanks for the information. I'm guessing since I'm not really a "healthy individual" that my body used most of the 50 mg and that is why the urine was not dark.

 

[bjl218]

That's a great article @Hip. But what's still not clear to me about B2 is whether taking the co-enzymated form (FMN) is sufficient or whether you really need to take non-coenzymated riboflavin in order for it to be converted to both FAD and FMN. Would you happen to have an opinion on that?