What is this pill - White Round with 'BOIRON' imprint?

BOIRON produces homeopathic remedies that treat a wide range of common health conditions such as allergies, coughs, colds, flu, stress, arthritis pain, muscle pain, and teething.
You may need your pharmacist or a naturopath to identify this particular product.

It's an equiv for GasX

It's a ferrous sulfate tablet used for patients with anemia for iron deficiency.