Vitamin B2 (riboflavin) supplements with the fewest additives

Vitamin B2 (riboflavin) may help reduce the frequency of migraines, prevent cataracts, and more. However, many B2 supplements contain more than just the riboflavin. For example, silica or silicon dioxide are often added to prevent caking, magnesium stearate or stearic acid for easier manufacturing, hypromellose (hydroxypropyl methylcellulose) as an emulsifier or thickener, and gums to bind ingredients together.

I try to avoid these additives because they may have questionable health effects. If you want to do the same, my recommendations are:

Recommended as minimum-additive B2 capsules

Photo of BioTech Pharmacal B2-400 Riboflavin (Capsules, 400mg)
BioTech Pharmacal B2-400 Riboflavin (Capsules, 400mg)
Positives:
  • silica-free / silicon-dioxide-free
  • stearic acid-free / magnesium stearate-free
  • hypromellose-free / hydroxypropyl methylcellulose-free
  • free of gums
Negatives:
(none)
All ingredients:

Riboflavin USP (vitamin B-2), gelatin (Kosher and Halal certified).

Recommended as pure B2 powders

Photo of BulkSupplements Riboflavin (Powder)
BulkSupplements Riboflavin (Powder)
Positives:
  • silica-free / silicon-dioxide-free
  • stearic acid-free / magnesium stearate-free
  • hypromellose-free / hydroxypropyl methylcellulose-free
  • free of gums
Negatives:
(none)
All ingredients:

Vitamin B2 (as riboflavin).

Photo of PureBulk Riboflavin 5 Phosphate (Powder)
PureBulk Riboflavin 5 Phosphate (Powder)
Available on PureBulk
Positives:
  • silica-free / silicon-dioxide-free
  • stearic acid-free / magnesium stearate-free
  • hypromellose-free / hydroxypropyl methylcellulose-free
  • free of gums
Negatives:
(none)
All ingredients:

Vitamin B2 (as riboflavin 5 phosphate).

In the UK?

BulkSupplements and PureBulk will ship the recommended powders internationally, or you can try Metabolics brand which is UK-based:

Metabolics Vitamin B2 Riboflavin 5 Phosphate (Liquid)
Available on metabolics.com
Positives:
  • silica-free / silicon-dioxide-free
  • stearic acid-free / magnesium stearate-free
  • hypromellose-free / hydroxypropyl methylcellulose-free
  • free of gums
Negatives:
(none)
All ingredients:

Riboflavin 5 phosphate, purified water

Outside the US/UK?

BulkSupplements and PureBulk will ship the recommended powders internationally.

If you frequently need US-based products, Reship.com and MyUS.com can forward packages to you from the US.

If you find a better option in your country, please let me know in the comments.


Other vitamin B2 supplements

The following are other vitamin B2 supplements I'm aware of, sorted alphabetically.

Name Ingredients
Best Naturals Vitamin B-2 (Tablets)

Riboflavin (vitamin B-2), dicalcium phosphate, vegetable cellulose. Contains less than 2% of silica, vegetable magnesium stearate.

BlueBonnet Nutrition Vitamin B2 (Veggie Capsules)

Vitamin B2 (riboflavin), 100% kosher vegetable capsules, vegetable cellulose, vegetable magnesium stearate.

Carlson Labs B-2 (Tablets)

Riboflavin (as vitamin B-2), dicalcium phosphate, microcrystalline cellulose, croscarmellose sodium, stearic acid (vegetable), magnesium stearate (vegetable). may contain silicon dioxide.

Enzymatic Therapy Riboflavin (Tablets)

Riboflavin (vitamin B2), cellulose, modified cellulose gum, magnesium stearate, modified cellulose, stearic acid, silicon dioxide, fractionated coconut oil, and carnauba wax.

Epigenetics Vitamin B2 Riboflavin 5 Phosphate (Liquid)

Riboflavin, purified water, citric acid.

HoneyCombs Vitamin B2 Extract (Alcohol-free Liquid)

Riboflavin, alfalfa, parsley, kelp, rosehips, catalyst altered water, natural vegetable glycerin.

Natural Factors B2 Riboflavin (Tablets)

Riboflavin (vitamin B2), Cellulose, stearic acid, silica, coating. Contains soy.

Nature's Bounty Vitamin B-2 (Tablets)

Riboflavin (vitamin B-2), dicalcium phosphate, vegetable cellulose, vegetable magnesium stearate, silica.

Nature's Life B-2 Riboflavin (Tablets)

Riboflavin (vitamin B-2), calcium (as calcium carbonate), cellulose, stearic acid, acacia and silica.

Nature's Plus Vitamin B-2 (Tablets)

Riboflavin (vitamin B-2), microcrystalline cellulose, hydroxypropyl methylcellulose, di-calcium phosphate, stearic acid, rice bran, magnesium stearate, pharmaceutical glaze and silica.

Nature's Way Vitamin B2 (Capsules)

Riboflavin (vitamin B2), cellulose, gelatin (capsule), magnesium stearate.

NOW Foods B-2 (Capsules)

Riboflavin (vitamin B2), rice flour, gelatin (capsule), magnesium stearate (vegetable source) and silica.

Rexall Sundown Naturals High Potency B2 (Tablets)

Riboflavin (vitamin B-2), dicalcium phosphate, vegetable cellulose, vegetable magnesium stearate, silica.

Seeking Health Riboflavin (Capsules)

Riboflavin (as riboflavin 5'-phosphate sodium, riboflavin), HPMC (vegetable capsule), ascorbyl palmitate, and silica. GMO-free.

Solaray Vitamin B-2 (Capsules)

Riboflavin (vitamin B2), whole food base (whole rice concentrate including the kernel, polishings, hull, pure aloe vera gel [aloe officinalis]), gelatin (capsule), and magnesium stearate.

Solgar Vitamin B2 (Veggie Capsules)

Vitamin B2 (as riboflavin), vegetable cellulose, vegetable magnesium stearate, silica, microcrystalline cellulose.

Source Naturals, Coenzymated B-2 (Sublingual Tablets)

Riboflavin (from 25mg flavin mononucleotide, coenzymated), sorbitol, mannitol, natural peppermint flavor, and magnesium stearate.

Swanson Premium Vitamin B-2 (Capsules, 100mg)

Riboflavin USP (vitamin B-2), gelatin, microcrystalline cellulose (plant fiber), may contain one or both of the following: silica, rice concentrate.

Thorne Research Riboflavin 5' Phosphate (Veggie Capsules)

Riboflavin (as riboflavin 5' - phosphate sodium), aspartic acid, hypromellose (derived from cellulose) capsule, silicon dioxide.

Twinlab B-2 (Capsules)

Riboflavin (as riboflavin 5'-phosphate sodium, riboflavin), gelatin, potato starch, magnesium stearate, medium chain triglycerides.


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