As discussed in section IV, there is room for improvement in the SNR of the ZULF spectra by improving the sensitivity of the optically-pumped magnetometer for detection, reducing the polarization loss during sample transfer, and by increasing the concentration of hyperpolarized molecules. An appealing option to improve detection sensitivity is to employ high-sensitivity commercial optically-pumped magnetometers, which also serve to make ZULF NMR more accessible to a wider community .