Platinum is widely used in health care. Sources include:
For more information on platinum and its complexes, view Platinum metal complexes in medicine | Sponsored | Chemistry World
Platinum-containing cytostatic medications like Cisplatin are applied intravenously. The active substance spreads throughout the body and also crosses the blood-brain barrier. It accumulates especially in the kidneys, liver, intestines and testicles. The cytostatic agent and its metabolic products are excreted mainly in the urine, and to a small extent with bile, i.e. with the stool.
Data from Micro Trace Minerals suggests that hair reflects on past exposure to platinum-containing cytostatica.
More at: https://www.cancer.gov/about-cancer/treatment/drugs/cisplatin