Use microbes, algae, duckweed, or plant-cell cultures to produce deuterated and 13C/15N-labeled complex biomolecules that are expensive or impractical to synthesize chemically.
Could be fun, honestly.
[0] https://en.wikipedia.org/wiki/Fractionation_of_carbon_isotop... [1] https://pubmed.ncbi.nlm.nih.gov/7577891/ [2] https://pubmed.ncbi.nlm.nih.gov/1734681/ [3] https://en.wikipedia.org/wiki/List_of_C4_plants [4] https://en.wikipedia.org/wiki/Deuterated_drug#Examples
Contact DARPA for a lift !