Enhanced performance and fat loose

I am a 37 year old Mum, recently had my second baby. I gained 8kg during pregnancy and was active and training 5 to 6 days a week. I follow you on Facebook and feel you have the expertise to advise me of the correct supplement to assist with performance and fat loss. I am an avid runner and enjoy at least 2 to 3 HIIT sessions a week (per baby). I am keen to shift the weight ASAP but am feeling flat due to lack of sleep n need something to enhance my training and fat loss!!!

Thank you