Beyond the general six-ingredient overview, here's a focused look specifically at what L-Theanine contributes.
L-Theanine is described as an amino acid from green tea that promotes calm, focused attention and helps take the edge off everyday stress, per this formula's own materials.
Since this formula is marketed as non-stimulant, L-Theanine's calming mechanism is worth reading as distinct from — and complementary to — the alertness-and-energy roles played by B12 and Rhodiola elsewhere in the formula.