Im a group blood o male , should i really avoid whey protein supplement for my gym work out ? any suggestion or replacement for whey supplement?

Protein supplements: Ther are many sources of protein supplements besides whey. Protein from diet will work as well as supplements with vegetarian protein, pea protein, soy protein, rice protein etc.

Whey should be OK: I've read dr. D'adamo's book & remain skeptical. There isn't adequate science to support the assertion that all type o's should avoid dairy. See http://www.Earthsave.Org/health/bloodtyp.Htm for a good critique. I strongly recommend whey from grass-fed cows processed at low temperature such as whey cool: http://www.Rockwellnutrition.Com/p-designs-for-health-whey-cool-vanilla-organic-whey-protein.