U can fire away with saturation right from the start. Ur better off that way so you know how your body can handle it. Highly doubt you'll get sick but if you have to taper down from there due to issues that develop like hunger or other gastric effects then you can. Everybody is different, especially with the different peptides and their effects on body, some get hunger, some dont etc.
As far as healing purposes for tendons etc.. which was my main reason for considering peptides in the first place, you may notice less pain discomfort after a week or two but will have to be consistent for probably at least 6 to 8weeks for overall maximum healing effects..