Informed Sport
A thermogenic 'fat-burner' sold as capsules rather than a powder — its formula combines caffeine (around 200 mg per two-capsule serving) with green tea extract, bitter orange and cayenne. Unusually for this category, it's Informed Sport certified, so every batch is screened against the banned-substances list. £24.94 at Amazon UK (6,400 reviews) and £35.00 at Holland & Barrett.
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