Side-by-side · Research reference

ARA 290vsMazdutide

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

APhase 2HUMAN-REVIEWED17/59 cited

BPhase 3HUMAN-REVIEWED19/62 cited

ARA 290

EPO-Derived Peptide · Innate Repair Receptor Agonist

4 mgDaily doseBrines 2015 Culver 2017

28 daysPhase 2 durationCulver 2017

Non-erythropoieticSafety profileBrines 2015 Liu 2014

SQ · DailyBrines 2015 Culver 2017

Mazdutide

GLP-1/Glucagon Dual Agonist · Oxyntomodulin Analogue · Phase 3

9 mgWeekly doseJi 2026

12.4%Weight lossAzam 2026

Phase 3Status (China)

SQ · Abdomen · Once WeeklyJi 2026

01Mechanism of Action

Parameter

ARA 290

Mazdutide

Primary target

Innate repair receptor (EPO receptor / CD131 heterodimer)

GLP-1 receptor and glucagon receptorAbdul 2026 Elmendorf 2026

Pathway

EPO/CD131 → JAK2 activation → PI3K/AKT, MAPK signaling → anti-inflammatory, anti-apoptotic cascades

Dual agonism: GLP-1R → satiety, insulin secretion, gastric emptying delay; GCGR → hepatic lipolysis, energy expenditure, thermogenesisElmendorf 2026 Abulehia 2026

Downstream effect

Tissue protection, nerve fiber regeneration, suppression of inflammatory macrophage activation, altered T-cell differentiation (↑Treg, ↑Th2, ↓Th1)Liu 2014 Culver 2017

Weight loss via appetite suppression (GLP-1 axis) and increased energy expenditure (glucagon axis); improved glycemic control in T2D

Feedback intact?

N/A — does not interact with hematopoietic EPO receptorLiu 2014

Yes — physiological receptor-mediated signaling preserved

Origin

11-amino-acid sequence from EPO helix B, engineered to eliminate hematopoietic activity while retaining tissue-protective properties

Synthetic oxyntomodulin analogue — endogenous peptide with dual GLP-1/glucagon activity

Antibody development

Not reported in clinical trials

—

02Dosage Protocols

Parameter

ARA 290

Mazdutide

Standard dose (Phase 2)

4 mg / dayBrines 2015 Culver 2017

Sarcoidosis SFN and diabetic neuropathy trials.

—

Frequency

Once daily

Self-administered subcutaneously.

Once weeklyJi 2026 Luo 2026

Duration

28 days (Phase 2)Culver 2017

Corneal nerve improvements observed by day 28.

—

Evidence basis

Phase 2 RCTsCulver 2017 Brines 2015

64-subject sarcoidosis trial, type 2 diabetes trial.

Phase 2 RCT / Phase 3 ongoingJi 2026 Luo 2026

Route

SubcutaneousBrines 2015

SubcutaneousJi 2026

Timing

Any time of day

No circadian dependence reported.

—

Phase 2 studied dose

—

9 mg / weekJi 2026

Highest efficacy dose in obesity trial (BMI ≥30 kg/m²).Ji 2026

Dose escalation

—

3 mg → 6 mg → 9 mg (titration schedule in trials)

Gradual escalation to minimize GI side effects.

Duration (trials)

—

24–48 weeks

Population

—

Non-diabetic adults BMI ≥30 kg/m² or ≥27 kg/m² with comorbidities

Phase 3 comparator

—

Semaglutide 1 mg/week (DREAMS-3 trial)Luo 2026

03Metabolic / Fat Loss Evidence

Parameter

ARA 290

Mazdutide

Primary effect

Improved metabolic control (HbA1c, fasting glucose)Brines 2015

Secondary to neuropathy treatment; direct lipolytic effects not established.

—

HbA1c

Significant reduction vs placebo

Observed in type 2 diabetes + neuropathy trial.

—

Fasting glucose

Improved in ARA 290 group

—

Body composition

Not directly quantified

Fat loss not a primary endpoint; metabolic improvements may reflect insulin sensitivity.

—

Percentage body weight loss

—

12.4% (pooled meta-analysis, 9 mg dose)

95% CI: -16.15% to -8.68%, random-effects model.Azam 2026

Absolute weight loss

—

9.8 kg (mean)Azam 2026

95% CI: -13.15 to -6.37 kg.Azam 2026

Responder rate (≥10% loss)

—

Not explicitly reported in available abstracts

Mechanism

—

Appetite suppression (GLP-1) + energy expenditure (glucagon)Elmendorf 2026

BMI reduction

—

Significant reduction in Chinese adults BMI ≥30 kg/m²Ji 2026

Visceral fat

—

Expected benefit from glucagon-mediated lipolysis (not quantified in abstracts)

Glycemic improvement

—

HbA1c reduction in T2D cohort (Phase 3 DREAMS-3)

Comparator efficacy

—

Head-to-head vs semaglutide 1 mg (Phase 3 pending publication)Luo 2026

Key publications

—

Ji et al. Med 2026 · Azam et al. Diab Obes Metab 2026 · Luo et al. Contemp Clin Trials 2026

04Side Effects & Safety

Parameter

ARA 290

Mazdutide

Injection site reaction

Mild, transient

—

Hematopoiesis

None — non-erythropoietic

Distinguishes ARA 290 from native EPO.

—

Cardiovascular

No thrombotic events or hypertension reported

—

Immunogenicity

No antibody formation reported

—

Tolerability

Well-tolerated in Phase 2 trialsCulver 2017 Brines 2015

Generally well-tolerated; GI effects diminish with dose titration

Gastrointestinal symptoms

—

Nausea, vomiting, diarrhea (most common, GLP-1 effect)

Injection site reactions

—

Erythema, pruritus, local discomfort

Hypoglycemia

—

Low risk in non-diabetic cohort; monitor in T2D with insulin or sulfonylureas

Cardiovascular effects

—

Increased heart rate (glucagon effect, transient)

Pancreatitis risk

—

Theoretical (incretin class effect); monitor amylase/lipase if abdominal pain

Thyroid C-cell tumors

—

Black box warning for GLP-1 class (rodent data); human relevance unclear

Gallbladder disease

—

Cholelithiasis, cholecystitis (rapid weight loss effect)

Absolute Contraindications

ARA 290

·Hypersensitivity to ARA 290

Mazdutide

·Personal or family history of medullary thyroid carcinoma
·Multiple endocrine neoplasia syndrome type 2 (MEN 2)
·Hypersensitivity to mazdutide or excipients
·Pregnancy

Relative Contraindications

ARA 290

·Active malignancy (theoretical EPO-axis concern; not observed in trials)

Mazdutide

·History of pancreatitis
·Severe gastroparesis or GI motility disorders
·Diabetic retinopathy (monitor, risk of worsening with rapid glycemic change)
·Renal impairment (limited data, use with caution)

05Administration Protocol

Parameter

ARA 290

Mazdutide

1. Preparation

Reconstitute lyophilised powder per manufacturer instructions. Use sterile technique.

Supplied as pre-filled pen or reconstituted vial (per manufacturer instructions). Inspect solution — should be clear, colorless to pale yellow. Discard if cloudy or particulate matter present.

2. Injection site

Subcutaneous — abdomen, thigh, or upper arm. Rotate sites to avoid lipohypertrophy.

Subcutaneous — abdomen preferred, also thigh or upper arm. Rotate sites weekly. Avoid areas with scarring, moles, or active inflammation.

3. Timing

Once daily, any time of day. Self-administered in Phase 2 trials.Brines 2015

Once weekly, same day each week. May be taken with or without food. If dose missed, administer within 3 days; if >3 days, skip and resume next scheduled dose.

4. Dosing

4 mg daily for 28 days (Phase 2 protocol). Duration for chronic use not established.Culver 2017

Refrigerate 2–8 °C. Do not freeze. May be kept at room temperature (<25 °C) for up to 14 days if needed. Protect from light.

5. Storage

Lyophilised: store at controlled room temperature. Reconstituted: refrigerate, use within specified timeframe.

Use supplied needle or compatible insulin syringe (if reconstituting). Pinch skin, inject at 90° angle. Hold 5–10 seconds before withdrawing needle to prevent leakage.

06Stack Synergy

ARA 290

+ BPC-157

Moderate

View BPC-157 →

ARA 290 targets the innate repair receptor (EPO/CD131) for nerve regeneration and anti-inflammatory signaling, while BPC-157 promotes angiogenesis and tissue repair through distinct mechanisms (likely involving VEGF, growth hormone receptor pathways). Combined, they may address both neuroinflammation and structural tissue repair in neuropathy or injury models. No direct clinical data; mechanistic overlap in tissue protection.

ARA 290: 4 mg SQ · daily
BPC-157: 250–500 mcg SQ · daily
Frequency: Once daily, same or separate injections
Primary benefit: Nerve regeneration, pain reduction, tissue healing

Mazdutide

— no documented stacks