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Riboflavin 5'-Phosphate

Thorne
4.9
★ ★ ★ ★ ★
(2199 ratings)
Riboflavin 36.5 mg
Product Image
Score79
A clearly disclosed active-form riboflavin capsule with a substantial amount. Form quality is the strength, while serving value is the main weakness.
How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:

Score 79

A clearly disclosed active-form riboflavin capsule with a substantial amount. Form quality is the strength, while serving value is the main weakness.
How scoring works

Also available as

3 options
18.0mg • 60 Tablet(s) servings B2 18 mg • 60 Tablet(s) • 60 servings $11.29 ($0.18 per serving) 50.0mg • 60 servings B2 50 mg • 60 Capsule(s) • 60 servings $12.09 ($0.20 per serving) 50.0mg • 30 servings B2 50 mg • 30 Capsule(s) • 30 servings $8.37 ($0.27 per serving)
$32.00($0.53 per serving)
Vitacost
$ 32.00
Pure Formulas
$ 32.00
iHerb
$ 32.00
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Analysis

Riboflavin 5'-phosphate sodium supplies 36.5 mg in an active coenzyme form. The single-active capsule is concise and directly aligned with focused B2 supplementation.

The active form avoids the initial conversion step required by standard riboflavin, although most people can still use conventional B2. The label does not provide added purity or release details beyond the named form.

The package provides a moderate supply for assessing regular use. Serving value is limited compared with other active-form and standard-form options.

Who is it for
  • Adults deliberately seeking riboflavin 5-phosphate
  • People who prefer an active coenzyme form over standard B2
Best for
  • Active-form vitamin B2 supplementation
  • A concise one-capsule routine

Pros

  • 36.5 mg riboflavin 5'-phosphate sodium
  • Active coenzyme form
  • Single-active capsule
  • Clearly disclosed amount

Cons

  • Amount remains far above routine nutritional needs
  • No purity standard is provided
  • No sustained-release feature is listed
  • Limited serving value

Warnings

  • Riboflavin can turn urine bright yellow; the color change is expected and harmless.
  • A high-potency serving may cause nausea or loose stools in sensitive users.
  • The active form does not remove the need to avoid unnecessary stacking with other high-dose B-complex products.

Nutrient quality

92 Highest impact

Form quality is favorable because a riboflavin phosphate form is included. A focused ingredient list keeps the formula aligned with its purpose.

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Ingredient transparency

75 High impact

The active form and weight are named, though phosphate yield is not clarified. Full usage directions and inactive ingredients are not supplied.

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Customer satisfaction

71 High impact

Customer ratings are strong with a large volume of ratings. Specific review comments are absent, so recurring complaints and purpose-matched experiences cannot be judged.

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Value for money

74 High impact

The serving cost is elevated but partly supported by formula quality. A focused ingredient list preserves core value.

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Ingredients

IngredientAmount per serving
Riboflavin (Riboflavin 5'-Phosphate Sodium)
 36.5 mg
Gluten Free Adults 18–50
Report overview
Riboflavin (Riboflavin 5'-Phosphate Sodium) · 36.5 mg OverallScore75
A+ Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyD+ Value

Bioactive R5P is supplied at a moderate amount. The capsule supports quick release in the digestive tract. Premium R5P partly offsets the high serving cost.

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74 Performance

Methyl-Guard Plus

Thorne
<p>Stronger supplied quality and collection evidence favors active riboflavin 5-phosphate at 90 mg over the original’s active riboflavin 5-phosphate at 36.5 mg. The formula remains closely aligned with riboflavin use, while dose, format, and missing label details remain practical trade-offs.</p>
77 Performance

Nu-Thera Multivitamin with P5P

Kirkman
<p>Stronger supplied quality and collection evidence favors active riboflavin 5-phosphate at 7.5 mg over the original’s active riboflavin 5-phosphate at 36.5 mg. The formula remains closely aligned with riboflavin use, while dose, format, and missing label details remain practical trade-offs.</p>
83 Performance

B-2 100 mg

NOW
<p>Stronger supplied quality and collection evidence favors standard riboflavin at 100 mg over the original’s active riboflavin 5-phosphate at 36.5 mg. The formula remains closely aligned with riboflavin use, while dose, format, and missing label details remain practical trade-offs.</p>
83 Budget

R-5-P Coenzymated Vitamin B-2 50 mg

Swanson Ultra
<p>Lower serving cost makes active riboflavin 5-phosphate at 50 mg the more economical riboflavin option. Compared with the original’s active riboflavin 5-phosphate at 36.5 mg, the supplied formula changes the dose, form, or supporting ingredients, so those differences should guide the choice.</p>
83 Budget

BioCoenzymated Riboflavin 5'-Phosphate 50 mg

Natural Factors
<p>Lower serving cost makes active riboflavin 5-phosphate at 50 mg the more economical riboflavin option. Compared with the original’s active riboflavin 5-phosphate at 36.5 mg, the supplied formula changes the dose, form, or supporting ingredients, so those differences should guide the choice.</p>
74 Budget

Riboflavin 400 mg

Seeking Health
<p>Lower serving cost makes active riboflavin 5-phosphate at 400 mg the more economical riboflavin option. Compared with the original’s active riboflavin 5-phosphate at 36.5 mg, the supplied formula changes the dose, form, or supporting ingredients, so those differences should guide the choice.</p>
83 Value

Vitamin B2 100 mg

NaturesPlus
<p>A stronger quality-to-cost balance makes standard riboflavin at 100 mg a practical value alternative to the original’s active riboflavin 5-phosphate at 36.5 mg. The supplied label keeps the riboflavin form and amount assessable, while the different dose, format, or supporting ingredients may affect individual fit.</p>
83 Value

Riboflavin 100 mg

Swanson
<p>A stronger quality-to-cost balance makes standard riboflavin at 100 mg a practical value alternative to the original’s active riboflavin 5-phosphate at 36.5 mg. The supplied label keeps the riboflavin form and amount assessable, while the different dose, format, or supporting ingredients may affect individual fit.</p>
83 Value

Riboflavin Vitamin B2 100 mg

Nature's Way
<p>A stronger quality-to-cost balance makes standard riboflavin at 100 mg a practical value alternative to the original’s active riboflavin 5-phosphate at 36.5 mg. The supplied label keeps the riboflavin form and amount assessable, while the different dose, format, or supporting ingredients may affect individual fit.</p>
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