This testosterone formulation blends four esters to provide a structured release profile. Propionate initiates rapid hormonal activity, phenylpropionate and isocaproate maintain mid-range support, and decanoate ensures prolonged testosterone stability. Isocaproate, with its improved solubility and absorption, bridges the transition between fast and slow esters. The combination delivers steady anabolic support, helping to sustain muscle growth, recovery, and hormonal function with fewer hormonal spikes and crashes.
Llewellyn, W. (2017). William Llewellyn's Anabolics.
United States: Molecular Nutrition, LLC.
DrugBank (n.d.) 'Testosterone isocaproate', DrugBank Online.
Turza, A., Pascuta, P., Mare, L., Borodi, G., & Popescu, V. (2023) 'Structural Insights and Intermolecular Energy for Some Medium and Long-Chain Testosterone Esters', Molecules.
International Union of Basic and Clinical Pharmacology (IUPHAR) (n.d.). Testosterone isocaproate. British Pharmacological Society (BPS).
Disclaimer: Information provided it this page is for general information only and does not substitute for professional medical advice.
For detailed information about Sustaxyl 350 by Kalpa Pharmaceuticals, consult with your doctor or healthcare professional.
Llewellyn, W. (2017). William Llewellyn's Anabolics.
United States: Molecular Nutrition, LLC.
Turza, A., Pascuta, P., Mare, L., Borodi, G., & Popescu, V. (2023) 'Structural Insights and Intermolecular Energy for Some Medium and Long-Chain Testosterone Esters', Molecules.
Llewellyn, W. (2017). William Llewellyn's Anabolics.
United States: Molecular Nutrition, LLC.
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