Thyroid glandular supplements (desiccated)

Tier 4 — risky / avoid · Thyrotoxicosis · Hormonal disruption · Undeclared hormones

Supplements made from desiccated animal thyroid glands that contain unpredictable amounts of active thyroid hormones (T3 and T4). Multiple case reports document thyrotoxicosis, atrial fibrillation, and bone loss from thyroid glandular supplements sold as "natural energy boosters." FDA has issued warnings. Hormone content varies wildly between batches. Can cause dangerous cardiac arrhythmias in people with underlying heart conditions.

Dose: AVOID — contains unpredictable amounts of active thyroid hormones; risk of thyrotoxicosis and cardiac arrhythmia