Halotestin vs Semax
Well Studied vs Well Studied
monitor Mechanism-based · 51% Both Halotestin and Semax can raise blood pressure. Monitor BP regularly and consider adding cardiovascular support (cardarine, telmisartan, or similar).
Molecular Data
Halotestin Semax
Weight 336.44 Da 813.93 Da
Half-life ~9.5 hours 0.5-2 hours
Chain — 7 amino acids
Type 9-fluoro-11-beta-hydroxy-17-alpha-methyltestosterone (C20H29FO3) ACTH(4-10) synthetic analog
Key Benefits
Halotestin
01 Dramatic increase in strength and power output without water retention
02 Pronounced increase in aggression and competitive drive
03 Does not aromatize to estrogen, producing a hard and dry appearance
04 Enhances red blood cell production and oxygen-carrying capacity
05 Rapid onset of effects, typically noticeable within days
06 Uniquely suited for pre-competition or pre-meet peaking protocols
07 Short cycle duration limits cumulative exposure
Semax
01 Rapid brain delivery via intranasal route
02 Rapidly increases BDNF levels
03 Extensive clinical research in Russia
04 Easy self-administration
05 Modulates dopamine and serotonin systems
06 Neuroprotective effects
Dosing Protocols
Halotestin
10-20 mg/day / Split into 2 doses daily (morning and pre-training)
Semax
300-600mcg per dose (up to 1000mcg for intensive use) / 1-2x daily (morning recommended for cognitive boost)
Research protocol 500-750mcg 1x daily
Intensive protocol 750-1000mcg 1-2x daily
Side Effects
Halotestin
Severe hepatic stress (elevated ALT, AST, GGT, bilirubin)
Pronounced aggression and irritability
HDL cholesterol suppression and LDL elevation
Elevated blood pressure
Headaches (frequently reported, may be related to blood pressure changes)
Suppression of endogenous testosterone production
Oily skin and acne
Decreased appetite (potentially related to liver stress)
Semax
Mild nasal discomfort (nasal route)
Possible nasal sensation upon administration
Contraindications
Known or suspected prostate cancer
Breast cancer in males
Pregnancy (Category X - causes fetal harm)
Active liver disease or existing hepatic impairment
Severe cardiovascular disease or uncontrolled hypertension
Hypercalcemia
Nephrosis or nephrotic phase of nephritis
History of cholestatic jaundice or hepatic dysfunction from prior anabolic steroid use
Hypersensitivity to fluoxymesterone or any formulation component
Pregnancy or breastfeeding
Known peptide allergies
Do not exceed 4-week continuous use without medical supervision
Research Evidence
Halotestin Semax
Status Well Studied Well Studied
References 5 studies 5 studies
Latest October 2023 2025
FDA Approved Yes No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.