What is Cytomel?
- Cytomel is a synthetic T3 thyroid hormone.
- It works directly without needing conversion from T4.
- It is commonly used to treat hypothyroidism.
- It may help the body use energy more efficiently and support cellular metabolism.
Key Benefits
- May help support metabolism and energy levels
- Often used by people who experience fatigue or difficulty managing weight
- Appropriate dosing may help support recovery and maintain performance
- Sometimes used alongside fitness or body composition protocols
Cytomel Usage Guide
- General Wellness Support
Commonly considered by individuals experiencing symptoms associated with low thyroid function, such as:
- Frequent fatigue or low energy
- Feeling tired even after adequate sleep
- Difficulty losing weight despite diet control
- Cold hands and feet
- Irregular menstrual cycles
Suggested starting amount: 12.5 mcg (half tablet) in the morning every other day
Dosage may then be adjusted gradually based on individual response. Some people find 25 mcg per day sufficient.
- Use in Fitness / Cutting Protocols
Cytomel is sometimes used in bodybuilding or fitness routines to support fat metabolism and may be combined with other performance-enhancing compounds.
Examples often discussed include:
- T3 + Tren A / Primo / Masteron E
- T3 + Cardarine / SLU-PP-332
- T3 + HGH or MK-677
- T3 + GLP-1 compounds such as Tirzepatide
Suggested starting amount: 12.5 mcg before breakfast, then evaluate tolerance before increasing to 25 mcg per day.
If using more than 25 mcg daily, adequate protein intake and sufficient rest are important.
Directions
- Take on an empty stomach
- 30 minutes before breakfast
- Avoid taking together with iron or calcium supplements
- Small tablets are easy to split in half
Important Information
- Do not use together with beta blockers or heart-suppressing medications without medical supervision
- If used continuously for longer than 4–6 weeks, thyroid levels such as TSH, T3, and T4 should be monitored
- If rapid heartbeat, irritability, or hand tremors occur, discontinue use and seek medical advice









