riboflavin-5-phosphate source
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I found this on PureBulk. Is it good enough? I want to put it directly into the blood, I suppose I would need to be more careful about quality

Or is there any other suitable sources?
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@winters2
I currently own this, purchased from PureBulk. At the time, this was the only seller of riboflavin-5-phosphate that I was aware of. That was at least 8 years ago. I know there must be a shelf-life on supplements, but I keep most everything I buy after the expiration date. I can't find an expiration on this.I'm sorry I can't provide anything about the quality; but as I say, at the time PureBulk was the only seller of this.
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