Stomach Ulcer & Slow Heart Rate: The Caution, Explained

This site states this specific caution directly: have a mushroom allergy, a stomach ulcer or a slow heart rate.

Why this groups three distinct conditions in one point

Worth noting this site combines the mushroom-allergy caution with two additional, seemingly unrelated conditions — a stomach ulcer and a slow heart rate — worth discussing each specifically with your doctor rather than assuming one explanation covers all three.

What to actually do about it

Talk to your doctor before starting if you have a diagnosed stomach ulcer or a slow heart rate, mentioning the full ingredient list including both named extracts.