A master’s degree program does not remediate a poor undergrad GPA for MD programs.
For allopathic schools, grad coursework generates a separate GPA that adcomms do not considered during the admission process–unless it’s bad, in which case it’s a big negative.
This is partially due to widespread grade inflation in graduate programs and the essentially valueless credits given for research participation. Also adcomms like to compare apples-to-apples when considering applicants. Since few applicants hold advanced degrees, they don’t look at grad degrees or GPAs.
For allopathic schools, only a specialize grad program called a Special Master’s Program (SMP) will salvage a poor uGPA. SMPs are programs that mimic the types of coursework taken and the difficulty of the first year of med school. A SMP is a high risk-high reward path. Do well, finish in the top 10-20% of the class with a GPA>3.75 and you have a 50-50 chance of gaining an admission somewhere (most often at a DO program). Finish outside the top quintile or earn a gpa below 3.75 and you can kiss your hopes of a medical education good-bye forever.
Osteopathic med schools will include some graduate coursework when calculating cGPAs and sGPAs.