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- Understanding Vitamin B2Vitamin B2, also known as riboflavin, collaborates with other B-complex vitamins to convert carbohydrates, fats, and proteins into energy. It also aids in the regeneration of glutathione, an enzyme that neutralizes free radicals in the body.
- Health Benefits of Vitamin B2Riboflavin may reduce the frequency of migraine headaches and help prevent cataracts. It has also been shown to improve iron levels in individuals with iron-deficiency anemia.
- Sources of Vitamin B2Dairy products like milk, cheese, and yogurt are rich in riboflavin. Certain meats and leafy greens also provide this nutrient. Additionally, riboflavin is often added to "enriched" breads and cereals.
- Signs of Vitamin B2 DeficiencyA deficiency in riboflavin can lead to light sensitivity, causing the skin to become oily, scaly, and dry. It may also contribute to cataracts, making supplementation advisable for those with a history of the condition.
This content is intended for informational purposes only and is not a substitute for professional medical advice. The Editors of Consumer Guide (R), Publications International, Ltd., the author, and the publisher are not responsible for any outcomes resulting from treatments, procedures, exercises, dietary changes, actions, or medication applications based on this information. Always consult your physician or healthcare provider before starting any new treatment or health regimen.
What Is Vitamin B2?
Milk provides a rich supply of riboflavin, commonly referred to as vitamin B2.Nutritionists successfully extracted growth-promoting compounds from liver, eggs, milk, and grass. In 1933, L. E. Booher identified a yellow substance from milk whey that enhanced growth, noting that its effectiveness increased with the intensity of its yellow hue. This discovery revealed that all yellow growth-promoting substances in foods were identical—riboflavin.As nutritionists focused on the yellow compounds in food, biochemists examined a yellow enzyme crucial for the body's energy production. They eventually split the enzyme into two components: a protein without color and a yellow organic compound, which was identified as riboflavin. This breakthrough provided the first evidence of multiple B vitamins.The Role of Vitamin B2B6 (pyridoxine). Additionally, riboflavin plays a part in metabolizing othervitamins. Riboflavin is linked to glutathione, an enzyme that eliminates free radicals from the body. It aids in the restoration of this valuable compound.Riboflavin offers numerous health advantages, including the potential to reduce migraines and prevent cataractsBenefits of Vitamin B2
Riboflavin acts as an energy booster, supporting energy production in the brain's blood vessels. Research suggests that riboflavin supplements may help decrease the frequency of migraine headaches. Additionally, riboflavin may aid in preventing cataracts, likely due to its connection with glutathione, a powerful antioxidant. A study involving 408 women in the Boston area found that those with the highest riboflavin intake had the lowest rates of cataract formation and lens opacity.
Riboflavin supplements may be effective in reducing the occurrence of migraines.Riboflavin could benefit individuals with sickle-cell disease; a daily dose of 5 mg twice a day was shown to increase glutathione and iron levels in patients' blood. In cases of iron-deficiency anemia, riboflavin supplementation improved iron levels when combined with iron supplements. Active older women require more riboflavin than those who are less active, given its role in energy production. While supplementation prevented low riboflavin levels, it did not enhance endurance in the studied group. High doses of riboflavin are non-toxic, with 5 to 10 mg per day being sufficient for general health. The body can absorb up to 20 mg at once, and excessive intake may temporarily turn urine bright yellow due to its fluorescent properties. Dairy products, certain meats, and leafy greens are rich sources of riboflavin. For more details on riboflavin-rich foods, continue to the next page.Riboflavin is just one essential nutrient among many. Explore these links to learn more about the vitamins necessary for maintaining overall health.- Vitamin A, or retinol, is crucial for vision. Discover more in How Vitamin A Works.
- A deficiency in vitamin B1, or thiamin, leads to beriberi. Learn more in How Vitamin B1 Works.
- Vitamin B3, or niacin, functions as a coenzyme, aiding in the conversion of food into energy. Explore further in How Vitamin B3 Works.
- In How Vitamin E Works, learn about this powerful antioxidant and its extensive health benefits.
- Vitamin K is essential for proper blood clotting. Find out more in How Vitamin K Works.
- For an overview of essential vitamins, recommended daily intake, and dietary sources, visit our Vitamins page.
- To compare prices on vitamin B2 supplements, click here.
Foods That Contain Vitamin B2
Milk stands out as the top source of vitamin B2 in the American diet. One glass supplies 25% of the daily riboflavin requirement for men and 33% for women. Cheese, yogurt, and ice cream are also rich in this nutrient. Additionally, meats like liver and kidney, along with certain leafy greens, are excellent sources. Riboflavin is also added to enriched breads and cereals.
Milk, cheese, and yogurt are particularly rich in riboflavin, making them excellent dietary choices.Riboflavin is resistant to heat and oxygen but degrades when exposed to light. Milk can lose over half of its riboflavin content if left in light for four to six hours. To avoid this, store milk in opaque containers like cardboard or colored plastic instead of clear glass or translucent plastic.Dietary Requirements of Vitamin B2The recommended daily allowance (RDA) for riboflavin is 0.5 mg per 1,000 calories, translating to 1.3 mg for adult men and 1.1 mg for adult women. Pregnant women require an extra 0.3 mg, while nursing mothers need an additional 0.5 mg during the first six months and 0.4 mg in the following six months. For individuals over 50, the RDA decreases slightly to 1.4 mg for men and 1.2 mg for women due to reduced energy needs. Use this chart to identify riboflavin-rich foods.| Food | Quantity | Riboflavin (mg) |
| Milk shake, thick | 1 cup | 0.5 |
| Cottage cheese, low-fat | 1 cup | 0.41 |
| Milk, whole | 1 cup | 0.39 |
| Buttermilk, from whole milk | 1 cup | 0.38 |
| Buttermilk, from skim milk | 1 cup | 0.37 |
| Yogurt, low-fat frozen | 1 cup | 0.37 |
| Pancakes | 3 medium | 0.36 |
| Sweet potatoes | 1 cup | 0.33 |
| Pretzels | 1 cup | 0.25 |
| English muffin | 1 medium | 0.24 |
Vitamin B2 Deficiency
A deficiency in vitamin B2 can cause the skin to become oily, scaly, and dry, with cracks or fissures at the corners of the mouth, inflamed lips, and a smooth, reddish-purple tongue. Since prolonged riboflavin deficiency leads to severe eye damage in animals, some experts suggest that eye issues like cataracts in humans may be linked to low riboflavin levels. Studies show that individuals with cataracts often have lower riboflavin levels in their blood compared to those without. Supplementation may be beneficial for those who have had cataracts and wish to prevent recurrence.
Some believe that eye issues, including cataracts, may result from a lack of riboflavin.Sensitivity to light can indicate a riboflavin deficiency, though it is often associated with a broader deficiency of multiple B vitamins. Since B vitamins function together in a chain of reactions, a shortage of one disrupts the entire process. As discussed, vitamin B2 is a crucial component of the B-complex vitamins that support energy production in the body. Use the insights from this article to ensure you meet your daily riboflavin needs.Riboflavin is just one of many essential vitamins for maintaining overall health. Explore the links below to learn more about these vital nutrients.ABOUT THE AUTHOR:Jennifer Brett, N.D. is the director of the Acupuncture Institute for the University of Bridgeport and a faculty member at the College of Naturopathic Medicine. A renowned expert in her field, Dr. Brett specializes in treating various conditions using nutritional and herbal therapies. She has been featured on WABC TV (NYC) and Good Morning America to discuss the health benefits of herbs.
