Get 10% off with WELCOME10
Sign up for our emails and get 10% off your order with code WELCOME10 (one use per customer). We send marketing emails only to people who sign up, and every email includes a one-click unsubscribe link.
Free U.S. shipping on every order · Free 30-day returns · Real help by email





Orders are prepared in 1–3 business days and arrive 3–7 business days after they ship. Alaska, Hawaii, Puerto Rico, U.S. territories and APO/FPO/DPO addresses can take longer. You get a tracking number by email as soon as your order ships.
Free returns within 30 days of delivery: we email you a prepaid return label, no reason needed. Items must be unopened, with the manufacturer or tamper-evident seal intact, in their original packaging. Opened, used or partially consumed vitamins, minerals and supplements, items with broken or missing seals, and gift cards can't be returned. Damaged, defective, incorrect or expired items are always covered. Refunds go back to your original payment method within 10 business days of approval.
If you have a question about an item, its label or your order, email sales@naturalvitaminsonline.com with the product name or order number. We answer every message by email and reply within 1 business day (Monday to Friday, Eastern Time).
Talk to your doctor or pharmacist before starting a supplement, especially if you're pregnant or nursing, take medication, or have a medical condition.
†These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
Talk to your doctor or pharmacist before starting a supplement, especially if you're pregnant or nursing, take medication, or have a medical condition.
Thyroid Specific Formulations T2 T3 Conversion Booster is a 60-capsule thyroid support supplement designed to support conversion from inactive T4 to active T3 and T3 to T2.
Thyroid Specific Formulations made this supplement for people seeking nutritional support for thyroid hormone conversion, including those focused on hypothyroidism or Hashimoto’s. Its purpose is to support the body’s natural hormone pathways and metabolic function, rather than replace a thyroid medication or care plan. The formula is also positioned for reverse T3 support, with T3-to-T2 conversion as part of its stated focus.
It is formulated to support the conversion of inactive T4 into active T3, as well as T3-to-T2 conversion. These pathways are the focus of the product’s thyroid support approach. The formula is intended to support natural thyroid hormone balance, metabolic function and cellular energy production; individual results are not guaranteed.
Each capsule contains selenium, zinc and botanical extracts, including clinically studied ingredients, in what the formula describes as optimal dosages. These components are included to support natural thyroid function and hormone balance. The product description does not identify individual botanical extracts or give ingredient amounts, so this page does not assign specific effects or doses to them.
Dr. Alan Christianson created the formula; he is a board-certified naturopathic endocrinologist and a New York Times bestselling author. It is designed to be used alongside thyroid medications and protocols, including thyroid ancestral supplements. It is made in the USA, with third-party testing for purity and potency.
This formula is suited to adults seeking capsule-based nutritional support for thyroid hormone conversion, metabolic function and energy as part of a thyroid wellness routine. It is intended to complement—not replace—thyroid medication or a care plan. Its defining fit is support for T4-to-T3 and T3-to-T2 conversion in a 60-capsule formula.
Q: What does Thyroid Specific Formulations T2 T3 Conversion Booster support?
A: Thyroid Specific Formulations T2 T3 Conversion Booster is designed to support conversion from inactive T4 to active T3 and T3 to T2, along with natural thyroid hormone balance.
Q: Which ingredients are in Thyroid Specific Formulations T2 T3 Conversion Booster?
A: Thyroid Specific Formulations T2 T3 Conversion Booster contains selenium, zinc and botanical extracts in a 60-capsule formula.
Free standard shipping on every order to U.S. addresses, with no minimum. Orders are prepared in 1–3 business days and arrive 3–7 business days after they ship. Alaska, Hawaii, Puerto Rico, U.S. territories and APO/FPO/DPO addresses can take longer. You get a tracking number by email as soon as your order ships. See shipping details.
Free returns within 30 days of delivery. Free returns within 30 days of delivery: we email you a prepaid return label, no reason needed. Items must be unopened, with the manufacturer or tamper-evident seal intact, in their original packaging. Opened, used or partially consumed vitamins, minerals and supplements, items with broken or missing seals, and gift cards can't be returned. Damaged, defective, incorrect or expired items are always covered. Refunds go back to your original payment method within 10 business days of approval. See returns & refunds.
Damaged, defective, incorrect or expired item? Email your order number, a photo and the lot/expiration details to sales@naturalvitaminsonline.com and we will arrange a replacement or refund; this is always covered. Please report visible shipping damage within 7 days of delivery.
Sign up for our emails and get 10% off your order with code WELCOME10 (one use per customer). We send marketing emails only to people who sign up, and every email includes a one-click unsubscribe link.
Thanks for subscribing!
This email has been registered!