What is Liothyronine Sodium T3 25 (Astera Labs)?
Astera Labs T3 in 25mcg tablets, 50 to a sachet. The active thyroid hormone, and the strongest non-stimulant fat loss tool in the catalogue.
Also sold as Cytomel, Triostat, Tertroxin or liothyronine sodium.
Liothyronine is T3, the active thyroid hormone. Your thyroid mostly produces T4 and your body converts it to T3 as needed, so taking T3 directly skips that step and works immediately. It raises the rate at which you burn through everything, which is why it works and also why it is not selective about what it burns.
Liothyronine T3 25 benefits
- Raises metabolic rate directly, without waiting for conversion from T4
- Works immediately rather than building over weeks the way T4 does
- The strongest non-stimulant fat loss tool here, with no jitters and no effect on sleep
- Commonly run alongside anabolics, which is what keeps the muscle loss in check
- 25mcg tablets, which is the standard starting dose and a clean step size
Liothyronine T3 25 dosage
- Starting dose
- 25mcg per day for the first week
- Common range
- 50 to 75mcg per day
- Ceiling
- 100mcg per day, experienced only
- Ramp
- Increase by 25mcg every 5 to 7 days
- Coming off
- Step down by 25mcg every 5 to 7 days
- Duration
- 6 to 8 weeks including both tapers
Ramp up and ramp down. The dose ladder is the protocol, not a suggestion.
Run it with anabolics and keep protein high. T3 on its own in a hard deficit costs lean tissue.
Package content
- Tablets
- 50 per sachet
- Strength
- 25mcg liothyronine per tablet
- Liothyronine per sachet
- 1250mcg, which is 1.25mg
- Form
- Oral tablets
- Brand
- Astera Labs
A full 6 week protocol with both tapers uses roughly 90 to 110 tablets, so around two sachets.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Liothyronine T3 25 for?
People already in a deficit, running anabolics alongside, who want the last of the fat to move faster.
CYTOMED 25 is the same 25mcg strength from Deus Medical in a boxed blister.
How to use Liothyronine T3 25
Swallow with water, once daily in the morning. Take it at the same time each day and step the dose up and down rather than jumping.




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