[writer]

I'm writing something about nutrients and I need a collective name for the following groups of nutrients:

Betaine
L-carnitine
Carnosine
Citrulline
Creatine
Cystine
Gama aminobutyric acid (GABA)
Glutathione
Hydroxylysine
Hydroxytryptophan
Hydroxyproline (found in collagen)
Monosodium glutamate (MSG)
N-acetyl cysteine
Ornithine
S-Adenosyl methionine (SAM-e)
Taurine
Theanine
Tyramine

Some of the above are amino acids, some are amino acid derivatives and some are peptides, and I want to give them a collective name non-proteinogenic amino acids. How does this sound?

[Yggdrasil]

Monosodium glutamate is a standard, proteinogenic amino acid coded for by the genetic code.

[writer]

OK, I can describe monosodium glutamate under glutamic acid.

I intend to write an online article about each of the above nutrients and I need to put them into a single category, and my idea was to name it non-proteinogenic amino acids, even when some of them do not directly fit in; so I'm asking would this look as an error?

The idea is to get urls: website/nonproteingenic-amino-acids/betaine

[Yggdrasil]

Non-proteinogenic amino acids would probably be fine.  Maybe "amino acids and their derivatives" would fit as well.

[writer]

Yes, derivatives, or amino acid-like nutrients...

I appreciate.