12 Best Iron Supplements for 2024, According to Dietitians



3. Pure Encapsulations OptiFerin-C Capsules

Best with vitamin C

  • Form: capsule
  • Dose: 1 capsule per day
  • Number of servings: 60 per container

Healthline’s review

Pure Encapsulations OptiFerin-C contains 28 mg of iron bisglycinate,  plus it has 100 mg of vitamin C, which may help improve absorption.

The supplement is:

  • kosher
  • vegan-friendly
  • free of gluten, soy, and dairy

Pure Encapsulations products are produced in a CGMP-certified facility and are tested by third-party laboratories.

Pros & cons

  • high quality standards
  • contains vitamin C
  • third-party tested
  • certified gluten-free
  • non-GMO verified
  • vegan
  • may be difficult to find at local stores

Product details

  • Active ingredient(s) (serving strength): vitamin C 100mg (111% DV), calcium 11mg (1% DV), iron bisglycinate 28mg (165% DV)
  • Certifications: certified gluten-free


4. MegaFood Blood Builder Capsules

Best vegan


  • Form: tablet
  • Dose: 1 tablet per day
  • Number of servings: 30 per container

Healthline’s review

MegaFood Blood Builder provides 26 mg of iron in the form of iron bisglycinate, as well as 15 mg of vitamin C for improved absorption.

It also offers folate and B12, both of which are important for maintaining healthy blood cells.

MegaFood Blood Builder is certified vegan and non-GMO. The supplement is also tested for over 125 pesticides in MegaFoods in-house laboratory.

MegaFood supplements hold third-party certifications, including Certified B Corporation, Certified Glyphosate Residue Free.

However, they are not third-party tested for quality or potency.

Pros & cons

  • NSF-certified gluten-free
  • non-GMO verified
  • certified vegan
  • third party-verified glyphosate residue-free
  • expensive
  • not third-party tested for accuracy

Product details

  • Active ingredient(s) (serving strength): vitamin C 15 mg (17% DV), folic acid 680 mcg (170% DV), vitamin B12 30 mcg (1250% DV), iron bisglycinate 26mg (144% DV)
  • Certifications: certified gluten-free, certified vegan, glyphosate residue-free