how long until effects from l carnitine to work L-Carnitine is Underrated. New Meta Review Reminds Us Why Best Time to Take L-Carnitine:

Generally, these studies and post hoc meta-analysis failed to demonstrate clear beneficial effects of these vitamins on cardiovascular events whatever the vitamin combination, although the administration of pyridoxine, folate, and/or cobalamin often significantly lowered homocysteine levels [113,197,218,219]

Continuous gavage of AZE at a dose of 300 mg/kg for 26 days significantly reduced serum CK-NAC and CK-MB activities in ISO-treated rats, indicating its cardioprotective effects (Paulino et al., 2019)

Reduce the appearance of spots, giving the skin a brighter, glowing look

Effect of weekly zinc supplements on incidence of pneumonia and diarrhoea in children younger than 2 years in an urban, low-income population in Bangladesh: randomised controlled trial