l carnitine is used for L-Carnitine Uses & Benefits Explained: A Complete Guide L-Carnitine 3000 Liquid | 3000
Description
The benzyl alcohol acts as a preservative, inhibiting bacterial growth that could otherwise contaminate the solution and accelerate degradation

It may however take a few days or weeks (especially if addressing a B12 deficiency)

iCare does the opposite
10.1208/s12248-016-9901-6 AAPS J
