should i take l-carnitine before bed and Sleep: Does It Affect Rest or Sleep Quality? Best Time to Take L-Carnitine:

Ideally, biological materials would maintain functional integrity as well as a normal structure and can be recovered when needed

10.1016/s0002-8223(03)00983-0 187

[DOI] [PubMed] [Google Scholar] 4.Sikiric P, Rucman R, Turkovic B, Sever M, Klicek R, Radic B, Drmic D, Stupnisek M, Misic M, Vuletic LB, Pavlov KH, Barisic I, Kokot A, Peklic M, Strbe S, Blagaic AB, Tvrdeic A, Rokotov DS, Vrcic H, Staresinic M, Seiwerth S

The protein-containing supernatant was then removed from the extract by centrifuging at 14,000 rpm for 10 min at 4C

While this is legal, it can sometimes look suspicious to an officer who isn't familiar with supplements