Neurochem Int 50:418426 Dringen R, Pfeiffer B, Hamprecht B (1999) Synthesis of the antioxidant glutathione in neurons: supply by astrocytes of CysGly as precursor for neuronal glutathione
This company has a strong business and many positive qualities
Laurindo LF, Barbalho SM, Guiguer EL, da Silva Soares de Souza M, de Souza GA, Fidalgo TM, Arajo AC, de Souza Gonzaga HF, de Bortoli Teixeira D, de Oliveira Silva Ullmann T, Sloan KP, Sloan LA (2022) GLP-1a: Going beyond Traditional Use
While smaller needles do exist, they tend to be specialty medical equipment and are both much more expensive and much more difficult to find, so there's unlikely to be a reason you would have them