How can I lower my pulse rate?

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I have recently started selling my plasma to earn a bit of extra money so me and my kids can do fun stuff. The problem is that my pulse is a bit too high sometimes, and I get turned away and have to come back another day. I am slightly overweight, and I understand the best way to lower my pulse is to lose weight. Well, I'm working on that. I've lost 27 pounds since June. I also know that cardio exercise helps too. I do that also. Does anyone know of any types of foods or supplements that can help me to lower my pulse? Any help or references would be much appreciated.