A PhD in the biological sciences and/or chemistry can have a lot of career paths outside of academia. Especially in the private sector. Lots of science based companies hire PhDs: pharma, biotech, agrobusiness, finance, etc. A PhD in a science based field can also lead to patent law.
Most of these types of PhDs are fully funded…meaning that there is little out of pocket expense. While MBA/MD/PharmD may have greater job prospects, you’ll be funding your own education with a lot of loans.