4 weeks in on a S4 research using 5 day on 2day off . Results so far include muscle hardening very noticeable on resting biceps. Strength has increased by 20% with it seems like no end to sets with recovery and endurance unreal. Just when you thought you was done , rest and here we go again. Not a great deal of muscle soreness days later which makes me increase my weights next session. There was a few sides with a elite sensitivity to light to dark and hunger was weird. Not needing to eat but when eating it was awesome. Loved what I eating even more as tho I had been very hungry. Customer service and delivery from you guys was second to none. Ordered on a Sunday received on Tuesday morning. Well packed. Love the ease of use on your web site. Great quality products and service. I can't wait to purchase more from you guys.