Leptin

Endogenous leptin binds to receptors in the hypothalamus, reducing appetite and increasing energy expenditure when fat stores are adequate. People with obesity often have high leptin levels alongside leptin resistance, meaning the signal is not effective. Oral supplementation cannot deliver functional leptin because the protein is digested in the stomach. Homeopathic leptin products use extreme dilutions that contain no measurable hormone. Recombinant leptin (metreleptin) is a prescription injection used for congenital leptin deficiency and certain forms of lipodystrophy.

No oral dose can deliver functional leptin. Prescription metreleptin is dosed by a clinician for specific medical conditions.

Oral leptin has no functional timing because it is destroyed by digestion. Injectable metreleptin is administered on a clinician-determined schedule.

Homeopathic dilutions are unlikely to cause direct harm but offer no real benefit. Injectable metreleptin can cause antibody formation, hypoglycemia when combined with insulin, and rare lymphoma reports.

Real leptin therapy interacts with insulin and other diabetes medications, requiring close monitoring. Oral or homeopathic products have no pharmacological interactions because they contain no active hormone.