The use of amino acids, proteins and peptides is not considered to have any environmental impact.
This summary information comes from Fass.
Fass environmental information
Fass environmental information for Fragmin (dalteparin) from Pfizer (downloaded 2022-06-17).
According to the European Medicines Agency guideline on environmental risk assessments for pharmaceuticals (EMA/CHMP/SWP/4447/00) vitamins, electrolytes, amino acids, peptides, proteins, carbohydrates, lipids proteins, vaccines and herbal medicinal products are exempted because they are unlikely to result in significant risk to the environment.
Author: Health and Medical Care Administration, Region Stockholm