Allyl pyruvate was used to demonstrate the performance of the polarization transfer techniques for more practical PHIP applications. This molecule is generated via hydrogenation of propargyl pyruvate, with PHIP accumulated on the protons of the allyl moiety. Subsequent polarization transfer to a C nucleus of pyruvate and cleaving the alcohol moiety by hydrolysis produces a solution of hyperpolarized metabolite. This technique, dubbed PHIP SAH (Side Arm Hydrogenation), has the potential of providing hyperpolarized agents for in-vivo NMR and MRI. In our experiments we tracked polarization transfer for two relevant isotopologues of allyl pyruvate that contain a C nucleus in the pyruvate moiety. Fig. . Hydrogenation reactions used to study PHIP transfer in ultralow magnetic fields. At natural C abundance, each product molecule contains at most one C nucleus. Polarization transfer for isotopologues with C in positions 1 or 2 was examined.