D-Chiro-Inositol (DCI) supplements with the fewest additives

D-Chiro-Inositol may help lower testosterone in PCOS sufferers as well as improving insulin response, but many DCI supplements contain more than just the active ingredient. For example, silica or silicon dioxide are often added to prevent caking and magnesium stearate or stearic acid for easier manufacturing.

I try to avoid these additives because they may have questionable health effects. If you want to do the same, my recommendation for the purest D-Chiro-Inositol supplement is:

Recommended as purest DCI supplement:

Chiral Balance D-Chiro-Inositol
Available on store.chiralbalance.com

(about $1.97 per 1200mg dose with free shipping)

  • silica-free / silicon-dioxide-free
  • stearic acid-free / magnesium stearate-free
All ingredients:

D-Chiro-Inositol, capsule (made from pullulan).

Other D-Chiro-Inositol supplements

The following are other D-Chiro-Inositol supplements I'm aware of, sorted alphabetically.

Name Ingredients
Discover Nutrition D-Chiro-Inositol

(about $2.21 per 1200mg dose with shipping)

D-Chiro-Inositol, gelatin, magnesium stearate.

Health Concerns Chiroin

(about $2.96 per 1200mg dose with free shipping)

Available on vitaliving.com

Carob pod extract containing D-Chiro Inositol, cellulose, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, silicon dioxide, stearate, stearic acid, vegetable magnesium stearate, vegetable stearate, vegetable stearic acid.

Swanson Ultra D-Chiro-Inositol

(about $2.44 per 1200mg dose when buying 5 bottles for cheaper shipping)

Manganese (from manganese sulfate from Chirositol™ M), D-Chiro-Inositol [from Chirositol™ M carob extract (Ceratonia siliqua)], brown rice flour, gelatin. May contain magnesium stearate. May contain silica.

Vital Nutrients d-Pinitol 600

(about $2.42 per 1200mg dose with free shipping)

D-Pinnitol (3-O-methyl-D-chiro-inositol), chromium (polynicotinate), vitamin D3 (cholecalciferol), vegetable cellulose capsule. May contain ascorbyl palmitate. May contain silica.

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