In my research on the persistent doping issue in weightlifting, as well as most other sports, I've been going through the US Olympic Committee web site.
If you've paid any attention to excuses given for positive drug tests, putting blame on sports
supplement usage is probably the most common. Being unaware of a violation to a drug use violation is not really acceptable, but I'm certain it does happen in some percentage of the doping cases.
If you take supplements, then you may want to use this APP. It's called Supplement 411 and can be found in the Google Play APP store, but you can read more about it on the Olympic Committee web site. I found it to be slow and it does have some bugs, but it also has some great information. Of course, there are new supplements every day, as well as formula changes, so the list will never be complete.
The High Risk List is likely to be the most useful. Once you find the supplement you are looking for, you can click on the name and the link will take you to more detailed information, including: a packaging photo, the FDA nutritional chart, a Classification of the WADA violation category, and extra Notes section.
The example I looked up is ABsolute Fuel, manufactured by BioScience Institute, Inc., with a Classification of S6. Stimulants. The Notes sections is as follows: "Testing of Lot #13338007 revealed the presence of oxilofrine (also known as methylsynephrine). The FDA has clarified that methylsynephrine is not an allowable dietary ingredient. For more information please see USADA's FAQ on illegal Dietary Supplement Ingredients. The product label also includes a warning for athletes to consult their sport organization for restrictions on the use of dietary suplements."
"What the Label Says: The Supplement Facts panel lists "Citrus Aurantium 30% Synephrine"
I recommend using this only as a list of items not to use. If the supplement you are wanting to take is not on the list, that does NOT mean it OK.
I looked for Vitol supplements, which are manufactured by Val Vasilef, and I couldn't find them on the list.
All the best,