I'm 5'8 69kgs before I started using this mass gainer. I've been very desperate to gain some good mass. In the beginning I was skeptical that it would actually work but I was dead wrong. I'm currently my 2nd bag and I've gained solid 6kgs of mass. You just have to watch out the massive flatulence at the beginning but your body adapts eventually but I noticed that you should have a bit to eat rather than an empty stomach. Since then I've never had any trouble with any toilet run. During training days. I'm taking this with 3 scoops in the morning with small leafy meal. 2 scoops at lunch time then 3 scoops straight after workout. On non training days, just 2 scoops in the morning. A serving of a normal protein shake then 2 scoops in the arvo. Nevertheless, I'm very very happy with this product and will use it again till I reach 78kgs+. Lastly, I've just purchased my third bag before writing this review! that's how much I love this. Thanks Sprintfit! The BEST pricing in NZ!