Yes they can be taken together or at the same time the Instructions for taken all products are as follows:
Fat Burner Instructions
On normal days: Take 2 capsules in the morning after breakfast.
On exercise days: Take 2 capsules before exercise with food.
(Maximum of 2 capsules per day)
Tight Tummy Instructions
Take 2 capsules daily after breakfast, or when feeling bloated 2 capsules after each meal. Maximum 6 capsules per day
Take 3 capsules per day, 1 capsule after breakfast, lunch and dinner.
Fierce Pre workout Instructions
Mix 1 scoop with 8-12 Oz of water 30-45mins prior to training. Take with food, If first time user mix half a scoop. (Do not use at the same time as the fat burner leave at least 3 hours difference)