Hiya,
My husband is 6ft and is quite big built anyway so carries his weight well. He's usually around 14 1/2 stone. When we started the gym before he lost weight and went down to around 12 1/2 stone, and I personally thought he looked ill! But.....that weight might be perfect for you! but I think you'll know when your at your ideal weight because you'll just feel it! slilly sounding I know, but it's true.
Men do lose more on lipotrim and I have seen many women you have lost 4stone in 3 months! so if men lose it quicker you'll be at your personal goal in no time!