Here are the ones I have found to be most helpful
Avoid copying doses from the internet or mixing multiple products that contain the same ingredient
[...] Rated 5 out of 5 Iris The peptides mix easily in solution every time
Compared to the placebo group, patients who took 3 g of immediate-release nicotinic acid daily experienced an average 10% reduction in total blood cholesterol, a 26% decrease in triglycerides, a 27% reduction in recurrent nonfatal myocardial infarction, and a 26% reduction in cerebrovascular events (stroke and transient ischemic attacks)
If you are pregnant and interested in taking supplemental L-arginine, speak with a doctor for advice
Metabolic Health Research L-Carnitine has been studied in the context of metabolic syndrome, insulin resistance, and related conditions