I've been reading a bit about boosting HGH with niacin before anaerobic training. My intention is to use over the counter products, and not spend thousands of dollars on supraphysiological HGH injections. I've used OKG with great effect in the past, and I might combine the two. I'll use the niacin before sprints, and the OKG before bed on an empty stomach, and perhaps combine it with acetyl l-carnitine.
I've read that niacin is toxic, but I'll only use it before my sprints, which at most would be three times a week at no more than 500 mg.