l-carnitine safe L-Carnitine Side Effects & Safety:

However, you should notice changes in your cat's everyday behavior: increased energy, less lethargy, better appetite

The above article does mention its use for the treatment of glaucoma

doi: 10.1042/BJ20150658 67 YanTChenXZhanHYaoPWangNYangHet al

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The enzyme contains flavin adenine dinucleotide (FAD) as a prosthetic component, and as a result, normal enzyme activity is dependent on the dietary availability of riboflavin

Transl Androl Urol