Im a male with hemoglobin 12.9 gms % ... is this of concern? what should i do to raise it ? thank you ?

Borderline low: All labs should be interpreted in a clinical context. Work up is usually initiated looking for possible sources for bleeding and include iron studies if no obvious cause for anemia is present. Make sure you have a discussion with your doc about what are your options going forward.

Need more info: You need to see a doctor to ascertain the cause of anemia. The treatment should be directed to the cause, not the symptom. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.