Biostats: https://www.coursera.org/specializations/biostatistics-public-health
Epi: https://www.coursera.org/learn/epidemiology
https://www.coursera.org/specializations/professional-epidemiology
For Epi, the methods may not apply to you, as it's more focused in public health.. as you're focusing on Exposomics and Metabolomics (I actually had to look this up) it seems it's more biomedical focus. But most MPH and MSc in Epi take that intro to public health epi course.