UK Muscle Supplements | Authentic Protein, Creatine & Pre-Workout – Muscle Factory Muscle Factory stocks authentic UK muscle supplements from brands like Applied Nutrition, 10X Athletic and PER4M. Shop whey protein, creatine, pre-workout, and bundles online, with tracked UK delivery and free shipping on orders over £100. Prefer advice first? Visit our Blackburn or Bolton stores and talk to the team.