Collagen preparation for the controlled release of active substances

A number of polymers are used in the production of administration forms for pharmaceutical or cosmetic active substances. Depending on the site of application, these are used to impart to the respective administration form the desired properties. Agents for the treatment of wounds and implantable materials should be adapted to the surface of the respective application site, and they should not interfere with the function and activity of body cells, such as keratinocytes, fibroblasts, or endothelial cells. In these cases the spectrum of suitable polymers is therefore limited to those having an excellent compatibility on contact with connective tissue and which preferably are biodegradable. A collagen preparation for the controlled release of active substances is characterized in that it has mixtures of acid-insoluble collagens with different molecular weight distributions.