You know, I would not recommend using pre-natals - they are pretty powerful and Medifast already contains the essential vitamins and minerals we need.
There is usually no need to take any additional vitamins. Some people, who may have dry skin or sparse fur like me, may want to consider adding some essential fatty acids (two flaxseed capsules or flaxseed/borage combo capsules).
I took extra B vitamins, Omega 3 Fish Oil, Oil of Evening Primrose.
If a person is taking a regular daily multivitamin, no problem with that but the
pre-natals could push you over the limit on some vitamins. Water soluble would wee wee out but not the fat soluble…vitamins A,D,E, & K can be toxic…
As always, check with your doctor.