Side-by-side · Research reference

Melanotan-IIvsSemax

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

APhase 1Reviewed9/43 cited

BHuman-MechanisticDraft12/39 cited

Melanotan-II

MC1R + MC4R agonist · Tanning + sexual response

0.25–1.0 mgPer doseDorr 1996

Phase 1Evidence levelDorr 1996

~1 hrHalf-life

SQ · Abdomen · Loading 5–7 days, then maintenance

Semax

Cognitive enhancer · Russian Pharma

200–600 mcg/doseIntranasalKaplan 2017

HumanMechanisticKaplan 2017

~30 minOnset

Intranasal · 2–3×/day during cognitive demand

01Mechanism of Action

Parameter

Melanotan-II

Semax

Primary target

MC1R (skin) + MC3R + MC4R (CNS sexual / appetite)Dorr 1996

BDNF / NGF expression + monoamine modulationKaplan 2017

Pathway

MC1R agonism → melanocyte tyrosinase → eumelanin synthesis. MC4R → autonomic sexual arousal centresDorr 1996 Simerly 2023

↑ BDNF + NGF synthesis + 5-HT modulation → neuroplasticity + anxiolysis + cognitive enhancementKaplan 2017

Downstream effect

Skin darkening, photo-protection, increased sexual desire / spontaneous erectionDorr 1996

Improved memory + attention; reduced anxiety; neuroprotection in ischemiaKaplan 2017

Feedback intact?

—

Origin

Cyclic 7-AA modified α-MSH analog; designed at University of ArizonaDorr 1996

Synthetic 7-AA peptide derived from ACTH(4-7) with C-terminal Pro-Gly-Pro stabilising tailKaplan 2017

Antibody development

—

02Dosage Protocols

Parameter

Melanotan-II

Semax

Loading phase

0.25–0.5 mg/day SQ × 5–7 daysDorr 1996

Builds up to visible tan.

—

Maintenance

0.5–1.0 mg 1–2×/week

After visible tan develops; supports with UV exposure.

—

Frequency

Daily during loading; 1–2× per week maintenance

2–3× per day during cognitive demand

Lower / starter dose

0.1 mg / day

Conservative starter — assess tolerability for nausea.

100 mcg / dose

Evidence basis

Phase 1 + anecdotalDorr 1996

Human-mechanistic + Russian clinicalKaplan 2017

Duration

8–12 weeks per cycle

10–14 day cycles, repeated PRN

Reconstitution

Bacteriostatic water; protect from light

Pre-formulated nasal spray (commercial); research vial: bacteriostatic water

Timing

Evening preferred (24h tan-development cycle)

Morning + early afternoon

Half-life

~1 hour plasma; effects on melanocytes persist days

Short plasma; CNS effect lasts ~3–6 hr

Standard dose

—

200–600 mcg / dose intranasalKaplan 2017

04Side Effects & Safety

Parameter

Melanotan-II

Semax

Nausea

Common, especially loading phase

—

Flushing

Common transient

—

Spontaneous erection

Common in men — MC4R cross-effectDorr 1996

—

Increased mole / freckle pigmentation

Existing moles darken; new lesions possible

—

Melanoma risk

Theoretical concern — increased melanocyte activity; CAUTION in melanoma history

—

Appetite suppression

MC4R-mediated; mild

—

Pregnancy / OB

Contraindicated

Avoid

Nasal irritation

—

Mild burning or congestion (transient)

Sleep disruption

—

Late-day dosing may interfere with sleep

Headache

—

Uncommon, transient

Long-term safety

—

Limited Western RCT data

Absolute Contraindications

Melanotan-II

·History of melanoma or atypical mole syndrome
·Pregnancy / breastfeeding
·Active uncontrolled hypertension

Semax

·Pregnancy / breastfeeding

Relative Contraindications

Melanotan-II

·Significant freckling / dysplastic nevus
·Personal or family melanoma history

Semax

·Active psychiatric instability
·Concurrent strong stimulants

05Administration Protocol

Parameter

Melanotan-II

Semax

1. Reconstitution

Add 2 mL bacteriostatic water to 10 mg vial → 5 mg/mL = 500 mcg per 0.1 mL. Light-protected.

Pre-formulated nasal spray (commercial) or research vial reconstituted with bacteriostatic water.

2. Injection site

SQ — abdomen. Rotate sites.

Intranasal — 2–3 sprays per nostril per dose. Tilt head slightly back.

3. Timing

Evening preferred. UV exposure (sunlight or tanning bed) helps develop tan.

Morning + early afternoon. Avoid evening (sleep disruption).

4. Storage

Lyophilised: refrigerate, light-protected. Reconstituted: refrigerate ≤30 days.

Refrigerate after reconstitution; light-protected.

5. Needle

29–31G insulin syringe.

Cycle on/off to avoid neurochemical adaptation.

06Stack Synergy

Melanotan-II

— no documented stacks

Semax

+ Selank

Moderate

View Selank →

Semax (cognitive enhancer, BDNF/NGF) and Selank (anxiolytic + immune) form the canonical Russian "neuro stack" — both intranasal peptide bioregulators with complementary axes. Semax for cognitive demand; Selank for stress mitigation.

Semax: 200–600 mcg intranasal · morning + afternoon
Selank: 150–300 mcg intranasal · midday + early evening
Primary benefit: Cognitive enhancement + stress mitigation

Kaplan 2017 Zaderej 2014