Armour Thyroid Forest vs Thyroid by Erfa:

Thyroid by ERFA is equivalent to Armour Thyroid by Forest. Thyroid by ERFA contains the same active medicinal chemical composition which is dessicated (Natural) thyroid derived from the dried thyroid glands of pigs. The differences exist in the non-medicinal ingredients (i.e. buffers and fillers) used to make up the tablet.

Thyroid by ERFA contains the following non-medicinal ingredients:

Cornstarch, Magnesium Stearate, Sugar and Talc. ERFA Thyroid tablets are Gluten, Paraben, Sulfite and Tartrazine free.

Armour Thyroid by Forest contains the following non-medicinal ingredients

Dextrose, Microcrystalline Cellulose, Sodium Starch Glycolate, Calcium Stearate and Opadry White (titanium dioxide used as a whitening agent). Armour Thyroid tablets do not contain gluten or lactose.

Reference/s :

https://www.northwestpharmacy.com/product/thyroid