If you are truly folate-deficient, supplementation can support recovery of blood cell production over weeks, and fatigue may gradually improve. However, expecting an instant “energy boost” in everyone is not realistic—benefit depends on whether a deficiency exists and what is driving it. Dietary insufficiency may respond faster, while malabsorption or coexisting deficiencies can slow the trajectory. In preconception and pregnancy planning, the goal is adequacy during an early, high-impact developmental window. The safest operating model is consistent use, outcome tracking, and alignment with clinician guidance when risk factors exist.