Both morning and evening administration work when injected in a fasted state the choice depends on your metabolic rhythm and training schedule
Hamilos DL, Zelarney P, Mascali JJ
Measurement of Carnitine, TMAO, -butyrobetaine, d9-carnitine, d9-TMAO, and d9--butyrobetaine Sample preparation and quantification for carnitine and TMAO in healthy volunteers Fifty microliters of plasma and 50 L urine samples were extracted with 450 L and 950 L methanol containing 200 ng/mL isotopically labeled internal standards (d3-carnitine and d9-TMAO) respectively, and the extraction was performed using the Geno/Grinder 2010 (SPEX SamplePrep., Metuchen, NJ, USA) at 1000 rpm for 3 min
N., Martin, N
Conforming to international standards (DIN-ISO 3585), this 10ml vial is an excellent choice for laboratory applications, providing reliability and safety.