i disagree, sorry nate. i think taking igf-2 with mass fx might be a good idea. seems i been seeing a few threads where some guys are getting prolactin issues on mass fx, the L-dopa in igf-2 might help with this. just an opinion. even if the prolactin thing is rare,an ounce of prevention goes a long way, even more so if he already has the igf-2. to the op-you might try taking the igf-2 only at bedtime.