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Thorne

Riboflavin 5' Phosphate, 36.5 mg, 60 Capsules

4.9 · 2189 reviews
3,398 ₽

Dietary Supplement Foundational Gluten Free Riboflavin, also known as vitamin B2, is necessary for the body to be able to activate vitamin B6. Riboflavin is also necessary for the body's conversion of tryptophan to niacin, and the conversion of folate to folate's various active forms. In addition, riboflavin plays a crucial role in the metabolism of fats and glucose, the synthesis of red blood cells, healthy methylation, and the production and regulation of certain hormones. To be utilized by the body, however, riboflavin must first be converted to its active form – riboflavin 5'-phospate (R5P). A compromised digestive system, however, can adversely affect the body's ability to convert riboflavin to R5P. And certain prescription medications can also compromise the absorption of riboflavin, putting it in a state of deficiency. Thorne's Riboflavin 5'-Phosphate, which is not derived from yeast, provides supplementation with a bioactive, tissue ready form of riboflavin that can be optimally utilized in the body.

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Dietary Supplement Foundational Gluten Free Riboflavin, also known as vitamin B2, is necessary for the body to be able to activate vitamin B6. Riboflavin is also necessary for the body's conversion of tryptophan to niacin, and the conversion of folate to folate's various active forms. In addition, riboflavin plays a crucial role in the metabolism of fats and glucose, the synthesis of red blood cells, healthy methylation, and the production and regulation of certain hormones. To be utilized by the body, however, riboflavin must first be converted to its active form – riboflavin 5'-phospate (R5P). A compromised digestive system, however, can adversely affect the body's ability to convert riboflavin to R5P. And certain prescription medications can also compromise the absorption of riboflavin, putting it in a state of deficiency. Thorne's Riboflavin 5'-Phosphate, which is not derived from yeast, provides supplementation with a bioactive, tissue ready form of riboflavin that can be optimally utilized in the body.

Customer reviews

5.0
verified purchase
Five Stars

As always, Thorne capsules are VERY easy to open and mix with food. Reordering! Some reviewers say they order Natural Factors brand instead, because it is cheaper. A warning for those reviewers. It contains organic spirulina, which may be from for example China. Stay in Thorne brand and you will be safe.

11/9/2019
4.0
verified purchase
Thorne, Riboflavin 5' Phosphate, 36.5 mg, 60 Capsules

I’ve started using this Riboflavin 5’ Phosphate as part of my nutrient rebalancing protocol. The quality is great as expected from Thorne — a very reliable brand. The capsule size is average and taste is manageable, with no aftertaste or GI discomfort. It’s too early to comment on the full benefit, but I’m hopeful that with consistent use, this active B2 will support my mitochondrial and detox pathways effectively. I’m sensitive to many B supplements, but this one feels safe and clean so far. Overall, a solid choice for anyone needing activated B2 without unnecessary fillers.

8/1/2025
5.0
verified purchase

I'd attempted sooo much for the agonizing red skin at the sides of my mouth. Explored and observed articles saying I wanted a top notch B-2. This aided inside 2 days! Presently I take it about each and every other day and skin stays cheerful. Love Thorne items.

11/13/2021
5.0
verified purchase
Throne, R5P, 36.5 mg, 60 Capsules

have been taking Throne for a while now, and I am very satisfied with the quality. The ingredients are clean, and the dosage is exactly what I need. The capsules are easy to swallow with no bad aftertaste. Great value for money, I will definitely buy it again!

7/5/2026
5.0
verified purchase
very good

very good, better the the other brands. dont take it in the evening, it can make you more energetic

4/3/2026
5.0
verified purchase

I always take this capsule with my routine in the evening with magnesium

2/23/2026
5.0
verified purchase
Thorne, Riboflavin 5' Phosphate, 36.5 mg, 60 Capsules

Very high quality supplement with the active riboflavin form that is easy to tolerate and well absorbed Ingredients are clean and minimal which is what I expect from Thorne The capsule size is small and easy to swallow and the bottle size is perfect for regular daily use and long term supplementation

12/15/2025
5.0
verified purchase
Great supplement

It was sort of a challenge finding R5P in this dosage - either it's gigantic or the wrong form. Thorne is also one of my most respected brands, so happy to find these.

12/12/2025
5.0
verified purchase
Great

Love theorem for their quality and effectiveness. B2 is great for mitochondria’s and energy production. The size of the capsule is so small, there will no be problem even for those with swallowing issues.

11/30/2025
5.0
verified purchase
최고!

Thorne's Riboflavin 5'-Phosphate is a top-tier B2 supplement. Choosing the active, coenzymated form ensures excellent absorption, which is vital for energy production and nervous system support, especially for individuals who may have genetic factors affecting nutrient processing. I've experienced a noticeable improvement in my overall vitality and mental clarity since starting this. The 60-capsule size is convenient, and I appreciate Thorne's commitment to quality. This is a reliable, high-potency product from a brand you can trust. Highly recommended for optimizing your body's energy pathways and getting true B-vitamin support.

11/30/2025