Leptin
Also known as: OB protein, Obese gene product
Adipokine hormone that regulates energy expenditure, appetite, and immune function through hypothalamic signaling.
Beginner Basics
Plain-English guide to Leptin
What it does
Leptin is a hormone that tells your body how full or hungry you are and helps control how much energy you burn. Researchers study it because it also affects blood sugar control, immune function, and reproductive health.
Typical dose
Researchers typically use 0.1 to 1 mg injected under the skin once or twice daily, with doses adjusted based on body weight.
When to inject
Evening is most common, or split between morning and evening to align with your body's natural rhythms.
Storage
Keep the dry powder in a cool, dark place until you mix it. Once mixed with water, store in the refrigerator and use within the timeframe specified by your supplier.
First-timer tip
Start at the lower end of the dose range and track how you feel for a few weeks before adjusting, since everyone responds differently and some people's bodies don't respond to leptin as expected.
On This Page
Research Status
Clinical trials
For research purposes only. Not approved for human use. Not medical advice.
Research Areas
Side Effects
Redness, mild swelling, or bruising at the injection site typically resolves within 24-48 hours. Minimize by rotating injection sites, allowing solution to reach room temperature, and using proper injection technique. Apply ice if needed.
Repeated injections at the same site can cause localized fat atrophy or hypertrophy. Prevent by systematically rotating injection sites and maintaining at least 1 inch between consecutive injection points. This is reversible if site rotation is implemented.
Mild headaches have been reported in clinical trials, typically occurring within hours of injection and resolving within 24 hours. May be related to rapid changes in metabolic signaling.
Transient nausea or mild GI symptoms may occur, particularly with higher doses. Usually self-resolving within 24 hours. Taking the injection in the evening may reduce daytime symptoms.
This is the intended pharmacological effect in research contexts. Ensure adequate caloric and nutrient intake to prevent unintended weight loss or nutritional deficiency.
Leptin increases metabolic rate and energy expenditure; some users report increased alertness or difficulty sleeping if injected too late in the day. Consider morning or early afternoon dosing if this occurs.
Leptin enhances immune function; rarely, users may experience mild fever or transient immune activation symptoms. This is typically self-limiting and reflects the peptide's immunomodulatory effects.
Leptin improves insulin sensitivity; patients on insulin therapy may experience hypoglycemia. Blood glucose monitoring is essential. Consult a healthcare provider before using leptin if taking insulin or glucose-lowering medications.
Severe allergic reactions including anaphylaxis are rare but possible. Symptoms include difficulty breathing, swelling of face/throat, or severe rash. Seek immediate medical attention if these occur. Discontinue use and do not re-inject.
Poor injection technique or non-sterile conditions can lead to bacterial infection. Signs include increasing redness, warmth, pus, or systemic fever. Seek medical evaluation if infection is suspected.
Dosing Reference
| Parameter | Value |
|---|---|
| Dose range | 0.1-1 mg |
Frequency, timing and route - members only | |
Research disclaimer
Figures drawn from published research literature and community logs. Not clinical recommendations. Consult a qualified professional. Research use only.
Reconstitution Guide
Do not use saline or bacteriostatic saline, use only bacteriostatic water for reconstitution
Do not shake the vial vigorously; gentle swirling prevents peptide degradation
Discard immediately if the solution appears cloudy, discolored, or contains visible particles
Use within 30 days of reconstitution when stored at 2-8°C
Do not freeze the reconstituted solution; freezing may denature the peptide
Use the PeptideVolt reconstitution calculator for your exact concentration
Molecular and Pharmacological Data
| Molecular weight | 16000 |
| Half-life | 24-25 hours (endogenous); recombinant leptin half-life approximately 4-6 hours in circulation |
| Sequence | Members only |
Leptin is an adipokine hormone produced primarily by adipose tissue that acts on leptin receptors (OB-R) in the hypothalamus to regulate energy homeostasis, appetite suppression, and metabolic rate. It signals the brain about energy stores, promoting satiety and increasing energy expenditure while simultaneously regulating immune function, reproductive hormones, and thyroid signaling through multiple downstream pathways including JAK-STAT, MAPK, and PI3K signaling.
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View all peptidesResearch Use Only. All content on this page is provided for informational and educational purposes related to scientific research. Leptin is not approved for human use by the FDA or any equivalent regulatory body. This is not medical advice. Do not use any substance discussed here for therapeutic, diagnostic, or preventative purposes. Consult a qualified healthcare professional before making any health-related decisions. The Peptide Volt does not endorse the use of any research chemicals. 18+ only.