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needed to make FAD[edit]

There was a question previously if riboflavin was necessary for the synthesis of FAD in all living cells. Looking at the structure of riboflavin, and then flavin mononucleotide, and then FAD, I see no way around it. Even if riboflavin is not an essential additive in species X, they'll have to synthesize riboflavin to be able to make FAD. David M


I believe beriberi is the result of a B1 defficiency, not B2... According to [1], "deficiency syndromes are characterized by sore throat, swelling of mucous membranes, mouth and/or lip sores, anemia, and dermatitis" - this doesn't sound like beriberi to me. Of course, I could be wrong - I'm not a doctor. User:nyh

After a lot of time with what I believe is a wrong fact (the beriberi connection) in the text, I decided to mark this as a factual dispute. I hope that someone can help me verify the correct fact. Nyh 08:53, 10 Mar 2004 (UTC)

  • You're right, it's wrong. Beriberi is caused by thiamine deficiency. A riboflavin deficiency doesn't have any "disease" name to go with it, probably because it almost invariably occurs in combination with deficiencies of other water-soluble vitamins. == Nunh-huh 08:58, 10 Mar 2004 (UTC)


The author has left me wondering what GM stands for in the sentence: "In processed foods it is very likely to be GM ..." I would have edited the article to make it less vague, except I am hardly an authority on biochemestry.

It stands for Genetically Modified, I believe; meaning it is produced by an engineered bacteria. However, I'm not sure this is the best way to word that paragraph (and we need to clarify and wikilink something there). I'm not sure how to improce it either.RJFJR 01:22, Feb 12, 2005 (UTC)

Bright yellow urine[edit]

I added a comment on this, I hope it's cool.


The designation "E101" appears twice in the article, but with no reference. I'm curious what it means. Anastrophe 05:23, 4 December 2005 (UTC)


I think a comment on the “bright yellow color” actually showing florescence under black light should be added. This fact shows why this vitamin is used as a food additive (Because of it’s nutritional value, and it’s effectiveness as a natural dye)


"it is thought deficiency is common"

By whom? This needs a reference cited. Very doubtful it is correct, especially in Western countries.

Added clarification and reference. Mild deficiency common in third world countries that do not have grain fortification policies; uncommon in U.S. and Europe. Data for the U.S. from NHANES and WWEIA.David notMD (talk) 17:02, 11 February 2016 (UTC)


There seems to be a contradiction: the first sentence states that Riboflavin is easily absorbed, and water soluble, the last paragraph says that it is not, and is secreted in urin (turning it bright yellow) and is difficult to deliver in water as it is insoluble!? any citation on this would be insightful.

this contradiction was added on March 23, 2004 if you look in the history

IS water soluble, but less so compared to other B vitamins. If not water soluble, would not turn up in urine! Commercially, most products are fortified foods (flour, bread, pasta) and tablet or capsule dietary supplements, so solubility problem sidestepped.David notMD (talk) 17:06, 11 February 2016 (UTC)


It's good to have a section discussing overdose conditions and symptoms in any page discussing a 'healthy vitamin'. If anyone has this information it'd be good to place it here.

Now covered under Toxicity. Riboflavin is considered non-toxic for the reasons given (increasingly poor absorption as dose is increased; efficient excretion by kidneys into urine; lack of identified adverse effects).David notMD (talk) 19:51, 10 February 2016 (UTC)

Factual discrepancies and errors[edit]

There seem to be a couple of factual discrepancies on this article. Some of the statements that are made, e.g. "Vitamin B2 is also required for red blood cell formation and respiration, antibody production, and for regulating human growth and reproduction. It is essential for healthy skin, nails, hair growth and general good health, including regulating thyroid activity," are not substantiated in the reference cited, and some other statements, e.g. "Any excess is excreted in the urine, frequently imparting a bright yellow color," seem to contain factual errors. Not being a biochemist myself, I don't feel confident making substantial changes, but are those statements valid? Katechen 20:48, 31 January 2007 (UTC)

simple wikipedia[edit]

Comment by User: moved from article:

Riboflavin was on the Nutrition facts of our Life Cereal box, we didn't know what it was, and decided to look it up. We still don't understand what it is.

I "translated" the page: simple:Riboflavin. I hope this helps. --Slashme 14:09, 3 September 2007 (UTC)

serum test[edit]

It's stated that measuring erythrocyte glutathione reductase reports on riboflavin levels. Any further comment/info on this? I have no reason to think it's incorrect, but it's clearly an indirect assay (presumably used in a standard clinical setting where more specialised analytical equipment is inappropriate?) —Preceding unsigned comment added by (talk) 20:54, 8 January 2008 (UTC)

sreyhsegaef dvb Dg i dont no —Preceding unsigned comment added by (talk) 13:37, 27 March 2008 (UTC)

Vitamin G[edit]

Vitamin G redirects here. It should be mentioned, or better explained, in the article.--Srleffler (talk) 05:46, 2 October 2009 (UTC)

Confusing infos all over the places....[edit]

-- (talk) 04:33, 2 December 2009 (UTC)

-- (talk) 05:42, 2 December 2009 (UTC)

Do you have a point, other than that you're confused? Yappy2bhere (talk) 00:01, 5 December 2009 (UTC)

Feb 2016: Text added in various places in attempt to make content clearer for people without a science background.David notMD (talk) 12:44, 10 February 2016 (UTC)

outside from text[edit]

This is outside from text: {{Chembox Hazards poop| FlashPt= Palapa (talk) 23:04, 22 September 2011 (UTC)

Thanks. The vandalism has been fixed.--Srleffler (talk) 06:08, 23 September 2011 (UTC)

How get image to show where wanted[edit]

The Image:Riboflavinspectra.jpg specified in the middle of the discovery section shows (eg. in Firefox and IE) no higher than the bottom of the infobox, which if the browser window is wide can be two sections lower. Do other users see this problems, and if so how do we fix it ? - Rod57 (talk) 23:36, 10 September 2012 (UTC)

I don't see the problem. Where is it that you want this image to be, vs. where it shows up for you? SBHarris 00:08, 11 September 2012 (UTC)
It is specified in the middle of the Discovery section which is where it would be logical and useful for it to be displayed; but if my browser window is wide it actually appears 2 sections lower so that the top of the image aligns with the bottom of the main infobox on the right. - Rod57 (talk) 23:18, 12 September 2012 (UTC)
But the spectra is a left thumb so I can't figure out how it gets to the right side of your display, where the infobox is. That doesn't happen on mine. Under the infobox on my display is the photo of fluorescent riboflavin solution in plastic tube. SBHarris 00:06, 13 September 2012 (UTC)

Deficiency cancer?[edit]

The statement, "Riboflavin deficiency has been implicated in cancer,[15]" is not supported by the paper given in the footnote. The paper presents a complex situation regarding riboflavin and cancer. It only suggests that riboflavin deficiency may increase carcogenicity in a very narrow situation. In other cases the situation is more complex. The statement misrepresents the content of the paper. I suggest that it be removed. 7802mark (talk) 01:33, 1 January 2016 (UTC)

I agree, and did so. The cancer reference in question was a speculative review from 1973. A search on more recent science lit did not find support for riboflavin deficiency increasing risk of any types of cancer.David notMD (talk) 05:17, 12 February 2016 (UTC)

Dietary Reference Intakes[edit]

I am creating the same format for DRIs for all B vitamins. That is a U.S.- based system that identifies Estimated Average Requirements (EARs), Recommended Dietary Allowances (RDAs), Adequate Intakes (AIs) if there is not enough information to establish EARs and RDAs, and Tolerable Upper Intake Levels (ULs). Another major regulatory agency that has established ULs is the European Food Safety Authority (EFSA). ULs for both are provided, as they often differ. If there is a UL (for some vitamins none has been determined) then rationale is covered in a Toxicity section. In addition to DRIs, the U.S. also established Daily Value, using it on food and dietary supplement labels as % DV. DVs were revised in May 2016. What I have written can be improved. It lacks EFSA or other major country RDAs. It lacks an estimate of what percentages of people are deficient - although that is often covered in a separate section on deficiency and consequences of deficiency. I am creating this Subject in all of the Talk pages of the vitamin and mineral entries I have edited. Comments and improvements are welcome. David notMD (talk) 14:13, 2 March 2016 (UTC)

Changed section title to Dietary recommendations because Dietary Reference Intakes is used only in U.S. and Canada; added European information, with citations. David notMD (talk) 12:56, 31 August 2017 (UTC)


Shouldn't this article include a section on biosynthesis? — Preceding unsigned comment added by (talk) 17:58, 18 April 2017 (UTC)

Why have mention of pricing?[edit]

In looking at the leads for all of the vitamins, most have no mention of cost. Would these articles be better if none mentioned cost? Or if all used the same source? Vitamin C states 3-7 cents per 100 mg tablet, referenced to: International Drug Price Indicator Guide. Management Sciences for Health, Arlington, VA. 2016. Folate and Vitamin B1 cite the same source, but the hyperlinks do not work. Vitamins B1 and B2 reference a text without a hyperlink [Hamilton, Richart (2015). Tarascon Pocket Pharmacopoeia 2015 Deluxe Lab-Coat Edition. Jones & Bartlett Learning. p. 230. ISBN 9781284057560.] which appears to apply to hospital prescription pricing, as the costs are far higher than vitamin supplement pricing. My preference is for no mention of cost. David notMD (talk) 10:45, 5 August 2017 (UTC)

How much medications cost, especially those on the WHO List of Essential Medicines is important with respect to global health. Doc James (talk · contribs · email) 23:15, 5 August 2017 (UTC)


The article currently has "Riboflavin was discovered in 1920" but it does not mention where it was discovered. I have local notes that state "milk" which did not help me much because... what type of milk? I assume cow milk. Anyway, could the main article please also mention in what TYPE of milk it was discovered? 2A02:8388:1603:CB00:3AD5:47FF:FE18:CC7F (talk) 11:18, 4 November 2017 (UTC)