Switch Nutrition Leucine provides 100% pure L-leucine — the most potent of the three branched-chain amino acids for stimulating muscle protein synthesis. Each serve is unflavoured, vegan, contains zero additives and contributes only 4 calories, making it highly compatible with any supplement stack or dietary approach. L-leucine activates the mTOR signalling pathway, which is the primary molecular trigger for muscle protein synthesis in skeletal muscle.

Leucine is unique among amino acids in its ability to independently stimulate anabolic signalling at sufficiently high doses. Research has demonstrated that leucine supplementation can enhance the protein synthetic response to both resistance training and dietary protein consumption, making it particularly relevant around training windows and meals. It also plays a role in regulating blood glucose by supporting insulin signalling and may help reduce muscle protein breakdown during caloric restriction.

Switch Nutrition Leucine is unflavoured and can be mixed directly into protein shakes, pre-workouts or any other supplement without altering the flavour. It can also be taken alongside whole-food meals to maximise the leucine threshold required for optimal muscle protein synthesis. Mix one serve in 150–200ml of water or directly into your post-workout shake.