Riboflavin (Vitamin B2)
Of 9,935 on-market riboflavin (vitamin b2) products in the January 2026 DSLD dump, the median declared dose is 4 mg, and 98.3% list Riboflavin as the primary form.
Form share
Of 9,366 products with an identifiable primary form, here is the share held by each form of Riboflavin (Vitamin B2) on the market today.
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| Form | Quality tier | n | Share |
|---|---|---|---|
| Riboflavin | Tier 1 | 9,206 | 98.3% |
| Riboflavin 5'-Phosphate (FMN) | Tier 2 | 160 | 1.7% |
Form share over time
Entry-year breakdown of the top forms, 2012–2025.
Dose distribution
Deciles of declared dose per serving (mg), among 9,705 products with a disclosed amount, against the RDA of 1.3.
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- 95.4% of products fall below the fairy-dust threshold (80 mg, 20% of the studied low dose).
- 0.4% of products don't disclose an amount because Riboflavin (Vitamin B2) is declared inside a proprietary blend.
Where does your dose rank?
Enter a per-serving dose (mg) to see exactly how it compares to the 9,701 on-market riboflavin (vitamin b2) products with a disclosed amount. The chart above groups doses into deciles; this looks up the exact percentile for one number.
By dosage form
By target group
Top brands
Search interest over time
How often people search for riboflavin (vitamin b2) on Google, US only, the last 5 years. This is public interest, not DSLD label data — a spike here doesn't necessarily line up with anything on this page, and Google's own index (100 = that term's peak popularity in the chosen window) is relative, not an absolute search-volume count.
Or see this search directly on trends.google.com.
Forms explained
FMN is hydrolyzed to riboflavin by phosphatases in the upper gut before absorption (IOM 1998, ch. 5), undercutting claims that the phosphorylated form is inherently more bioavailable. Jusko & Levy 1967 studied absorption and excretion of riboflavin-5'-phosphate in man (PubMed has no abstract, so the specific equimolar urinary-recovery result is unverified).
Source: Institute of Medicine 1998, DRI for Thiamin, Riboflavin, Niacin, B6, Folate, B12, Pantothenic Acid, Biotin and Choline, ch. 5; Jusko WJ, Levy G. 1967, J Pharm Sci 56(1):58-62, PMID 6030496
Elemental fraction: 82.5% (riboflavin-equivalent, free-acid FMN MW 456.35 vs riboflavin MW 376.37 (both confirmed PubChem formulas); the commercial sodium-salt/hydrate form will have a somewhat lower fraction -- approximation)
Because FMN is hydrolyzed to riboflavin in the upper gut before absorption (IOM 1998), FMN is not expected to be meaningfully more bioavailable than plain riboflavin at typical doses -- despite marketing as the "active coenzyme form," treated as functionally comparable rather than clearly superior. The widely-repeated "1.3-1.7x more bioavailable" marketing claim could not be traced to a primary RCT.
Source: Institute of Medicine 1998, DRI for B vitamins and choline, ch. 5; Jusko WJ, Levy G. 1967, PMID 6030496
Reference values
- RDA (adult): 1.3 mg — 1.3mg (men); 1.1mg (women), ages 19+
- Tolerable Upper Intake Level (adult): not established — Not established -- no adverse effects reported from high riboflavin intake (up to 400mg/day for 3+ months studied)
- Studied clinical dose range: 400–400 mg
- Schoenen J et al. 1998, Neurology 50(2):466-470, PMID 9484373 -- RCT (n=55), riboflavin 400mg/day reduced migraine attack frequency and headache days vs placebo (59% responder rate vs 15%, p=0.002). Only dose level tested in this pivotal trial -- not a range.