2D structure · PubChem CID 5920Liothyronine (T3)

ZionovaWeight lossSKU ZionovaCytomel

Zionova Cytomel

Liothyronine (T3) · Oral tablet

$108CAD

In stock, ships from Vancouver

Strength20 mcg per tablet

Pack50 tablets

Total per order1,000 mcg

Half-life≈ 2.5 days

Add $192 more for free Xpresspost.

Delivery guaranteeLost or seized: reshipped free
Tracking in 72 hPacked in Vancouver
Interace-TransferFrom any Canadian bank
Plain packagingNo product names outside

Overview

Cytomel is liothyronine (T3), the active form of thyroid hormone, prescribed for hypothyroidism.

How it works

T3 binds thyroid receptors in nearly every cell, raising metabolic rate, heart rate and body temperature. Taken from outside, it lowers the thyroid’s own output.

Chemistry

From PubChem, the US National Library of Medicine’s chemistry database.

Liothyronine (T3)

Formula: C₁₅H₁₂I₃NO₄
Molecular weight: 650.97 g/mol
CAS: 6893-02-3
PubChem CID: 5920 ↗

Clinical reference

For hypothyroidism the label starts at 25 mcg a day, adjusted to 25 to 75 mcg a day using TSH and T3 bloodwork. Health Canada’s labelling warns that thyroid hormones must not be used for weight loss.

Label and guideline amounts are shown for reference only. They are not a recommendation, and we never give cycle or performance amounts. Any use belongs under a doctor’s care, with bloodwork.

Measuring calculator

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Strength used: 20 mcg per tablet · pack: 50 tablets

Combinations and interactions

Prescribed or used alongside

In medicine it is sometimes combined with levothyroxine (T4).

Drug interactions

Warfarin: effect increases.
Diabetes medicines: requirements may change.
Calcium and iron supplements: separate by four hours.

Risks and bloodwork

Heart

Palpitations, fast heart rate and arrhythmias at excess amounts.

Muscle loss

Excess thyroid hormone breaks down muscle as well as fat.

Bone loss

With long-term excess.

Thyroid suppression

Your own thyroid output falls while you use it.

Bloodwork doctors check

Resting heart rate and blood pressure
TSH, free T3 and free T4
Potassium
An ECG if you have palpitations

Not for

People under 18, anyone pregnant or breastfeeding, and anyone with liver disease, heart disease, uncontrolled blood pressure or a hormone-sensitive cancer, unless a doctor directs otherwise.

Canadian legal status

In Canada this is a prescription drug under the Food and Drugs Act. Using it under a doctor’s care, with bloodwork, is how it is meant to be used. This is general information, not legal advice.

References

Use of liothyronine (T3) in hypothyroidism: Joint British Thyroid Association/Society for endocrinology consensus statementAhluwalia R et al. · Clin Endocrinol (Oxf), 2023 · PMID 37272400

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FAQ

How strong is each tablet?

20 mcg.

Is T3 the same as Synthroid?

No, Synthroid is T4 (levothyroxine).

How long does it last?

About 2.5 days.

How fast will it arrive?

Orders ship from Vancouver by Canada Post Xpresspost. You get a tracking number within 72 hours of payment; delivery then takes 1 to 2 business days in BC, 3 to 4 in Ontario and 3 to 5 in Quebec.

What if my parcel is lost or seized?

We reship it free. Contact us with your order number.

Adults 18+. This page is general information, not medical advice. Talk to a licensed healthcare provider before using any compound.