In psychological terms, the treat or reward concept is classified as «baiting», and will achieve certain results through trickery, much like a fisherman luring a fish onto a hook. (dog-training-norwalk-ct.com)
The earlier you start the less capital is required to achieve a certain result. (divhut.com)
There doesn't appear to be any specific scientifically backed recommended dosage, different studies used completely different doses to achieve certain results. (healthtrends.com)