Metabolic Investigational

AICAR

Also known as: Acadesine, AICA Ribonucleotide, ZMP precursor

A direct AMPK activator that mimics exercise at the molecular level — increases fat oxidation and endurance without physical training. Banned by WADA since 2009.

Popularity B
Class AMPK Activator (Nucleoside Analog)
Half-Life ~2-3 hours
Form Lyophilized powder
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AICAR C9H14N4O5
Research-Backed User Reports Sourced Updated Mar 2026
// Overview

What is AICAR?

AICAR (5-Aminoimidazole-4-carboxamide ribonucleotide, also known as Acadesine) is a cell-permeable nucleoside analog that activates AMP-activated protein kinase (AMPK) — the master metabolic switch that is naturally triggered by exercise and caloric restriction.

First studied in the 1980s for cardiac protection during surgery, AICAR gained widespread attention after a 2008 Salk Institute study showed it could increase running endurance in sedentary mice by 44% without any physical training. This led to it being dubbed an “exercise in a pill” and prompted WADA to ban it in competitive sports in 2009.

AICAR works by being phosphorylated inside cells to ZMP, which mimics AMP and directly activates AMPK. This triggers the same downstream metabolic cascades as exercise: increased fatty acid oxidation, enhanced glucose uptake, mitochondrial biogenesis, and improved insulin sensitivity.

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// How It Works

How AICAR Works

AICAR activates AMPK through a direct molecular mimicry pathway:

  1. ZMP conversion — AICAR is phosphorylated intracellularly by adenosine kinase to ZMP (AICA ribotide), which structurally mimics AMP and directly binds to the γ-subunit of AMPK.
  2. AMPK activation — Activated AMPK switches cellular metabolism from anabolic (building) to catabolic (burning) — the same metabolic shift triggered by exercise and fasting.
  3. Fatty acid oxidation — AMPK phosphorylates and inhibits acetyl-CoA carboxylase (ACC), removing the brake on mitochondrial fat burning.
  4. Glucose uptake — Increases GLUT4 translocation to muscle cell membranes, improving glucose uptake independent of insulin.
  5. Mitochondrial biogenesis — AMPK activates PGC-1α, driving new mitochondria production and increasing oxidative capacity — the hallmark of endurance training.
// Dosage Protocols

Dosage Information (User-Reported)

Disclaimer: Dosage information is compiled from user reports and published research. This is not medical advice. Consult a healthcare professional before use.
Level Dose Frequency Duration
Animal Studies 500 mg/kg Daily (injection) 4 weeks
Human Equivalent (est.) 150-500 mg Daily 4-8 weeks
Clinical (cardiac) 0.1 mg/kg/min IV Continuous infusion During surgery

What to Expect

Week 1-2

Increased warmth and energy expenditure noticed. Some users report improved exercise tolerance immediately. Mild injection site discomfort.

Week 3-4

Enhanced endurance becoming apparent. Fat loss may begin. Improved fasting glucose readings.

Week 5-8

Body composition changes visible. Endurance capacity significantly improved. Metabolic markers improving.

Note

Very limited human anecdotal data. Most evidence is from animal studies and clinical cardiac trials.

Common Stacks

MOTS-c

Dual AMPK Pathway

AICAR directly activates AMPK while MOTS-c activates it through folate cycle modulation — complementary mechanisms

SLU-PP-332

Exercise Mimetic Stack

AMPK + ERR receptor activation for comprehensive exercise pathway coverage

L-Carnitine

Fat Transport

Supports the increased fatty acid oxidation demand created by AMPK activation

// Preparation

Reconstitution & Storage

Reconstitute with sterile water or bacteriostatic water. Typical research concentrations: 50mg/mL. Filter if needed. Store reconstituted solution refrigerated.

Storage: Store at -20°C long-term. Reconstituted: 2-8°C, use within 7 days.

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// Safety Profile

Side Effects & Safety

Potential Side Effects

  • ! Injection site pain or irritation
  • ! Hypoglycemia risk (increased glucose uptake)
  • ! Lactic acidosis (theoretical at high doses)
  • ! Bradycardia (high-dose cardiac studies)
  • ! GI discomfort
  • ! Limited human safety data at research doses

Contraindications

  • ⚠ Diabetes with hypoglycemia risk
  • ⚠ Cardiac conduction disorders
  • ⚠ Pregnancy or breastfeeding
  • ⚠ Concurrent use of adenosine-related drugs
  • ⚠ Not established for routine human use

Legal & Regulatory Status

Not FDA-approved (Phase 3 for cardiac indication was discontinued). Prohibited by WADA (World Anti-Doping Agency) since 2009 under S4 category. Available as a research chemical. Not a controlled substance but banned in competitive athletics.

// Research

Published Research

// Where to Buy

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This content is for informational and educational purposes only. AICAR is sold for research purposes. Never Natty does not condone or encourage the use of any substance in violation of any laws. Consult a healthcare professional before using any compound discussed on this site.