HGH vs Liothyronine (T3)
FDA Approved vs FDA Approved
monitor Mechanism-based · 50% Both HGH and Liothyronine (T3) promote fat breakdown. While additive fat loss is possible, excessive lipolysis can cause rapid free fatty acid elevation and cardiac strain. Monitor heart rate and adjust doses gradually.
Molecular Data
HGH Liothyronine (T3)
Weight 22,124 Da 650.97 Da
Half-life 3-4 hours (SC), 20-30 minutes (IV) ~1 day
Chain 191 amino acids —
Type Single-chain polypeptide with two disulfide bridges Thyroid hormone (C15H12I3NO4)
Key Benefits
HGH
01 Improved body composition (increased lean mass, decreased fat)
02 Enhanced bone mineral density
03 Improved lipid profile
04 Increased exercise capacity
05 Better quality of life and mood
06 Skin, hair, and nail improvements
07 Enhanced recovery and healing
Liothyronine (T3)
01 Direct and rapid increase in basal metabolic rate
02 Enhanced fat oxidation and lipolysis
03 Improved energy levels and reduction of hypothyroid fatigue
04 Faster-acting than T4 with effects noticeable within hours to days
05 Useful when peripheral T4-to-T3 conversion is impaired (illness, caloric deficit, stress)
06 Supports body temperature regulation and thermogenesis
07 Can improve cognitive clarity and reduce brain fog associated with low thyroid function
Dosing Protocols
HGH
1-4 IU daily (0.33-1.33mg); start low and titrate up / Once daily or split into 2 doses (morning and evening)
Medical GHD (Starting) 0.15-0.3mg/day (0.5-1 IU) Once daily
Medical GHD (Maintenance) 0.4-0.8mg/day (1.2-2.4 IU) Once daily
Anti-Aging/Wellness 1-2 IU/day (0.33-0.67mg) Once daily
Body Recomposition 2-4 IU/day (0.67-1.33mg) Once or twice daily
Performance (Higher Risk) 4-8 IU/day (1.33-2.67mg) Split twice daily
Liothyronine (T3)
25-75 mcg/day (replacement) / 1-2x daily (oral)
Side Effects
HGH
Water retention and fluid accumulation
Joint pain and stiffness
Carpal tunnel syndrome (usually resolves with dose reduction)
Headaches
Numbness/tingling in hands
Liothyronine (T3)
Tachycardia and palpitations (increased heart rate, especially at higher doses)
Anxiety, nervousness, and irritability
Insomnia and disrupted sleep architecture
Increased sweating and heat intolerance
Tremor (fine hand tremor, similar to hyperthyroid presentation)
Increased appetite despite accelerated metabolism
Loose stools or increased bowel frequency
Contraindications
Active cancer (may accelerate tumor growth)
Acute critical illness (increased mortality in ICU patients)
Closed epiphyses in children (for growth promotion)
Pregnancy/breastfeeding
Untreated adrenal insufficiency (must correct cortisol deficiency before starting T3)
Acute myocardial infarction or unstable angina
Thyrotoxicosis or untreated hyperthyroidism
Known hypersensitivity to liothyronine or any tablet excipients
Uncorrected adrenal cortical insufficiency (risk of adrenal crisis)
Research Evidence
HGH Liothyronine (T3)
Status FDA Approved FDA Approved
References 4 studies 5 studies
Latest 2024 September 2023
FDA Approved Yes Yes
This comparison is for educational and research purposes only. Consult a healthcare professional before use.