l carnitine used VitaMonk GlycoTrax - High Absorption GPLC Supplement - No Artificial Fillers L-Carnitine, 500 mg Veggie Capsules

With a side chain pKa of 6, it can easily have its charge changed by a slight change in pH

What the Evidence Actually Shows Being honest about evidence is part of good medical content

Pepino extract (Solanum muricatum Ait.) on HDL and LDL in type 2 diabetic rats

Either way, this looks like a pretty legit level of research since systematic reviews are considered to be a highly credible form of evidence as it is looking across and assessing published research on a particular topic and essentially pooling together what the scientific community has managed to find while also getting rid of papers that may not meet the standards required to be included