What it is
Citrulline malate is citrulline bonded to malic acid. Malate is one of the steps in the cycle cells use to turn food into energy.
What it does in Memoclear
This form does two jobs. The citrulline half feeds the arginine-to-nitric-oxide loop, like the HCL form. The malate half feeds the cell's energy cycle and is involved in clearing ammonia and other waste that builds up when cells work hard. That waste is one of the things linked to the tired, heavy-headed feeling late in the day. In Memoclear it is the ingredient aimed at mental fatigue rather than blood flow alone.
Where it comes from in food
Citrulline from watermelon and cucumber; malate is the compound that gives apples and other fruit their tart taste.
What the research says
Citrulline malate has been studied mostly for physical fatigue in exercise, where several trials report less soreness and slightly better endurance. The waste-clearing mechanism is plausible for mental fatigue too, but it has not been tested directly for that in healthy adults.
Who should be careful
Well tolerated in most people. Same nitric-oxide interaction cautions as the other arginine and citrulline forms. Some people notice mild stomach upset at high doses.
Where it sits in the formula
L-Citrulline Malate works alongside the other five ingredients: L-Arginine (base), L-Arginine AKG 2:1 Extract, L-Citrulline HCL, Niacin (Vitamin B3), Beta-Alanine. Together they cover blood flow, cell energy and neuron protection in one daily capsule.
Further reading
Citrulline malate and fatigue, PubMed. This research is on the ingredient, not on the finished Memoclear product.