Side-by-side · Research reference

AdamaxvsGDF-8

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

AAnimal-StrongHUMAN-REVIEWED20/47 cited

BAnimal-StrongHUMAN-REVIEWED23/48 cited

Adamax

ACTH(4-10) Analogue · Russian Nootropic

1.4×BDNF protein ↑Dolotov 2006

3×BDNF mRNA (exon III)Dolotov 2006

1.6×trkB phosphorylationDolotov 2006

Intranasal · Research Use Only

GDF-8

TGF-β Superfamily · Negative Muscle Regulator

15–20%Muscle mass gain (MSTN−/−)

↓ AdiposityFat reduction (loss-of-function)Herman 2026 Jacquez 2026

No adversePhenotype (genetic null)Jacquez 2026

Not administered — research target for inhibition

01Mechanism of Action

Parameter

Adamax

GDF-8

Primary target

Melanocortin receptors (MC-Rs) in hippocampus and cortex

Activin type II receptors (ActRIIA/B) on skeletal muscleIglesias 2026

Pathway

ACTH(4-10) fragment → MC-R binding → BDNF/trkB upregulation → neurotrophic signaling

MSTN → ActRII/TGFBR1 → Smad2/3 signaling → muscle protein synthesis suppression

Downstream effect

Increased hippocampal BDNF expression, trkB tyrosine phosphorylation, enhanced conditioned avoidance learning, circadian rhythm normalizationDolotov 2006 Arushanian 2008

Restricts muscle hypertrophy, limits satellite cell activation, increases proteolysis via ubiquitin-proteasome and autophagy pathwaysGong 2026 Iglesias 2026

Feedback intact?

Non-endocrine — devoid of adrenal axis effectsvan 1978

Yes — part of muscle-pituitary endocrine axis; muscle-derived MSTN influences FSH synthesisIglesias 2026

Origin

ACTH(4-10) fragment with modified amino acid sequence at positions 8, 9, 10Teter 2001

Endogenous myokine secreted by skeletal muscle; circulates systemically as latent complexIglesias 2026

Antibody development

—

02Dosage Protocols

Parameter

Adamax

GDF-8

Animal dose (rat)

50 mcg/kg body weightDolotov 2006

Single intranasal application; produced maximal BDNF response.

—

Route

IntranasalDolotov 2006 Smolnik 2000

—

Frequency

Single-dose or chronic administration protocols

Chronic dosing normalized circadian rhythms; single-dose produced acute BDNF elevation.

—

Human dose (exploratory)

Not established — limited human data

ACTH(4-10) and analogs dosed 30–60 mcg intranasally in early human studies.

—

Evidence basis

Animal (rodent, rabbit) studies; minimal human RCT data

—

Timing

Variable — chronic administration for circadian effects

—

Clinical use

—

None — MSTN is a research target for inhibition, not a therapeutic peptide administered to humans

Sold by research suppliers (e.g., CertaPeptides) for in vitro / animal studies only.

Inhibition strategies

—

Monoclonal antibodies, VLP-based active immunotherapy, gene editing (CRISPR)

VLP immunogen (MS2.87-97)

—

Active immunization protocol in mice — elicits anti-MSTN antibodies without GDF11 cross-reactivityJacquez 2026

Reduces body fat, increases muscle mass and grip strength; no major safety concerns in animal models.Jacquez 2026

Dual immunization (MSTN + Activin A)

—

Combined active immunization in GH-deficient miceMansoor 2026

Improves skeletal muscle performance beyond single-target inhibition.Mansoor 2026

Gene editing outcomes

—

Precision CRISPR edits produce double-muscle phenotype, improved carcass quality in livestock

Pleiotropic effects on metabolism, reproduction, and welfare require systematic evaluation.

03Metabolic / Fat Loss Evidence

Parameter

Adamax

GDF-8

Primary mechanism

—

MSTN loss-of-function reduces fat accumulation independent of muscle mass effects

Human genetic evidence

—

Humans with MSTN function-disrupting variants have increased muscle mass, strength, and reduced adiposityHerman 2026

Animal model outcomes

—

VLP-immunized mice: reduced age-associated weight gain, significantly lower body fat by DEXAJacquez 2026

Adipose-muscle crosstalk

—

MSTN modulates myostatin-TAZ signaling; inhibition shifts adipose expansion toward hyperplasiaLi 2026

Metabolic benefits

—

Improved metabolic health in genetic MSTN null modelsJacquez 2026

Age-related effects

—

MSTN upregulation linked to age-dependent muscle atrophy and fat accumulation

04Side Effects & Safety

Parameter

Adamax

GDF-8

Cardiovascular effects

ACTH(4-10) fragments may have pressor and cardioaccelerator actions at high dosesGruber 1984

Effects attenuated by α/β-receptor antagonists; observed at 30–1000 nmol/kg IV in rats.

—

Natriuretic effect

ACTH(4-10) exhibited natriuretic activity at lower doses (7 nmol/kg)Gruber 1984

—

Behavioral suppression

Suppression of aggression, reduced orientation-cognition reactions in rabbitsTeter 2001

May reflect anxiolytic or stress-dampening profile.

—

Long-term safety

Unknown — chronic human safety data lacking

—

Genetic null phenotype

—

No known adverse phenotypes in humans or mice with MSTN loss-of-functionJacquez 2026

Antibody cross-reactivity risk

—

Non-selective inhibitors may block GDF11, affecting cardiac and neural function

VLP immunotherapy safety

—

No major safety concerns in mice; rare hypersensitivity possibleJacquez 2026

Echocardiography

—

No cardiac abnormalities detected in MSTN-immunized miceJacquez 2026

Pleiotropic effects (gene editing)

—

MSTN editing may affect reproductive performance, metabolic homeostasis, and animal welfare

Assay variability

—

Circulating MSTN levels often fail to mirror intramuscular changes; clinical interpretation challengingIglesias 2026

Absolute Contraindications

Adamax

·Pregnancy and lactation (precautionary; no data)
·Active cardiovascular instability (due to potential pressor effects)

GDF-8

·Not applicable — MSTN is not administered as a therapeutic agent

Relative Contraindications

Adamax

·Hypertension (monitor BP if using higher doses)
·Renal impairment (natriuretic effects may alter electrolyte balance)

GDF-8

·Inhibition strategies contraindicated in conditions requiring maintained muscle proteostasis (theoretical)

05Administration Protocol

Parameter

Adamax

GDF-8

1. Reconstitution (if lyophilised)

Add sterile water or bacteriostatic water to lyophilised vial per manufacturer guidance. Roll gently — do not shake. Ensure clarity before use.

GDF-8 (myostatin) is not administered to humans. It is studied as a target for inhibition using monoclonal antibodies, active immunotherapy (VLP-based vaccines), or gene editing (CRISPR). Research-grade peptide supplied by vendors like CertaPeptides is intended for in vitro and animal studies only.

2. Route

Intranasal administration is the primary route in animal and exploratory human studies. Delivered via nasal spray or dropper to ensure mucosal absorption.Dolotov 2006 Smolnik 2000

Clinical development focuses on blocking MSTN activity via: (1) neutralizing monoclonal antibodies targeting mature MSTN or ActRII receptors; (2) active immunotherapy generating endogenous anti-MSTN antibodies (e.g., MS2.87-97 VLP platform); (3) precision gene editing to disrupt MSTN expression in livestock or therapeutic contexts.

3. Timing

Variable. Single-dose protocols for acute cognitive tasks; chronic daily dosing for circadian rhythm normalization and sustained neuroprotection.

MS2.87-97 VLP administered to mice elicits anti-MSTN antibodies targeting a discrete epitope in mature MSTN protein. Immunization schedule and dose optimized for sustained antibody response without GDF11 cross-reactivity. No human protocols established.Jacquez 2026

4. Storage

Lyophilised: room temperature, light-protected. Reconstituted: refrigerate 2–8 °C, use within manufacturer-specified timeframe.

CRISPR-mediated MSTN knockout produces double-muscle phenotype in livestock (cattle, swine, sheep). Ethical frameworks and welfare assessments required; pleiotropic effects on reproduction, metabolism, and health must be systematically evaluated before human translation.

06Stack Synergy

Adamax

+ Semax

Moderate

View Semax →

Both Adamax and Semax are ACTH(4-10)-derived nootropics acting via melanocortin receptors and BDNF upregulation. Adamax has distinct amino acid modifications at positions 8-10, potentially offering complementary receptor binding profiles or metabolic stability. Stacking may amplify neurotrophic signaling and cognitive enhancement, though direct synergy studies are absent. Theoretical multi-pathway benefit.

Adamax: Research dose intranasal
Semax: 300–600 mcg intranasal
Frequency: Once daily, morning or pre-cognitive task
Primary benefit: Enhanced BDNF upregulation, cognitive performance, neuroprotection

GDF-8

— no documented stacks