Testosterone

Aspen Oss B.V offers a wide range of products which includes ethynodiol diacetate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes Lynestrenol. Therapeutic category: norsteroids. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes nandrolone decanoate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes norethindrone. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes progesterone. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes tibolone. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes testosterone cyclopentylpropionate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes testosterone decanoate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of high quality APIs including a portfolio of Testosterone esters. Testosterone enanthate is currently under evaluation at Aspen Oss. Please contact us for more information. 

Aspen Oss B.V offers a wide range of products which includes testosterone isocaproate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes testosterone phenylpropionate. Therapeutic category: steroid hormones. Contact us for more information.

Aspen Oss B.V offers a wide range of products which includes testosterone propionate. Therapeutic category: steroid hormones. Contact us for more information.

Our Green Continuous Liquid Phase Peptide Synthesis (GC-LPPS) combines the advantages of the classical solution-phase synthesis with the solid-phase approach. 

Aspen is a global specialty and branded pharmaceutical company committed to promoting access to medicines and improving the health of patients across the world through our high quality, affordable products. Active at every stage of the value chain, we are uniquely diversified by geography, product and manufacturing capability.

Your trusted partner for sterile injectable manuafacturing.

Generalist CMO
Sterile specialist
Growth partner


advantages:
more than 50 years expertise
global regulatory access and 
world-class capabilities 

Product list by Aspen API. all current API's. 
list dated spring 2026

List of all Aspen's APIs which are currently under development.2 categories: under development or candidates. 

Leaflet about Aspen API:Our Peptide development and manufacturing capabilities.
building on more than 60 years of peptide experience. 
our green answer to peptide synthesis.

excellence in Steroid Manufacturingadding Clascotereone and Segesterone acetate to our development portfolio.


more than 75 years of steroid manufacturing. 

the future in peptide manufacturing - Green Continuous LPPS

driving sustainable innovation in Peptide API Manufacturing 

Advancing sustainability in API manufacturing 

Practical pathways for Energy and Materials Transition


by Joris Gilberts, Sustainability Manager 
Aspen API, Oss, The Netherlands

List of References issued by Aspen API 

Aspen API in 3 minutes - video