Vitamin B2 (Riboflavin)
Vitamin B2 (riboflavin) is essential for energy production and antioxidant defense in cells. Testing identifies deficiency, which can cause fatigue, muscle weakness, and impaired recovery—particularly relevant if you have limited dietary intake of eggs, dairy, nuts, or leafy greens.
When elevated: Elevated B2 levels are uncommon because excess riboflavin is water-soluble and excreted in urine. High levels may occur with excessive supplementation but do not typically cause harm. When low: Low B2 indicates inadequate intake or absorption, which can lead to fatigue, mouth sores, skin issues, and impaired energy metabolism. Deficiency is rare in developed countries but more common in malnutrition, alcoholism, or certain digestive disorders.
B2 supports mitochondrial function and helps convert carbohydrates and fats into usable energy during training. Athletes with high training loads, restrictive diets, or plant-based eating patterns may have lower B2 status; adequate levels support aerobic capacity and reduce exercise-induced oxidative stress.
Turnaround Time
3 days (up to 7 days)
Order online
Choose your lab and check out. We send your lab requisition automatically — no doctor visit needed.
Get your sample collected
Visit a lab service center near you for a quick blood draw (or book at-home phlebotomy where available).
See your results
Your results land in your Insider portal, ready to review and act on — that easy.
Your price
$10.90$35
3.2× less than retail
Versus the typical direct-to-consumer retail price for this test (illustrative — consumer prices vary by provider and region).
$10.90
Vitamin B2 (Riboflavin)
Vitamin B2 (riboflavin) is essential for energy production and antioxidant defense in cells. Testing identifies deficiency, which can cause fatigue, muscle weakness, and impaired recovery—particularly relevant if you have limited dietary intake of eggs, dairy, nuts, or leafy greens.
When elevated: Elevated B2 levels are uncommon because excess riboflavin is water-soluble and excreted in urine. High levels may occur with excessive supplementation but do not typically cause harm.
The Vitamin B2 test starts at $10.90 at BioReference. No doctor's visit and no insurance needed; we do not bill insurance. Fitomics Insider members pay from $8.90.
Results for the Vitamin B2 test are typically ready about 3 days after your draw, and up to 7 days for some samples. Your results land in your Insider portal.
No. When you order the Vitamin B2 test from Fitomics Research Labs, a licensed physician in our 50-state network reviews and signs your requisition after checkout, and it lands in your portal and inbox. Then visit any Labcorp, Quest, or BioReference patient service center for your draw; results post to your Insider portal.
Looking for something else? Browse every test by category.
