I asked this question recently as I was worried I was going a bit overboard since I started raw feeding last year, although the supplements I do give I picked up from this forum
I feed quite a variety of raw meats, fish, eggs etc and sometimes bits of veg/fruit. I generally feed a mince with bone on a morning to which I add my supplements.
The supplements I currently use are Dorwest Keepers Mix, F4Ds Salmon Oil and CSJ Billy No Mates. I have also started giving a joint supplement as the dogs all do flyball.
I have recently joined a raw feeding group on facebook which I have found really useful, lots of experienced people but all doing their own version of raw and there doesn't seem to be a right or wrong way in terms of supplements. Its helped me venture into the world of pigs trotters and raw fish