Which chemo regimen?
There are things one can take which are thought to help lessen the neuropathy associated with Oxaliplatin, for example, but if s/he isn't getting oxi there's no point.
By "supplements" is it safe to assume that you are talking about things other than prescription anti-nausea drugs, and also not over the counter drugs commonly used, such as immodium for diarrhea and various stool-softeners and laxatives? You mean things like CBD oil, Vitamin Bcomplex, L-Glutamine, et al?
If you clarify the chemo, for example FOLFOX or FOLFIRI, people can be more helpful.
F, 64 at DX CRC Stage IV
3/17/18 blockage, r hemicolectomy
11 of 25 nodes,5 of 5 mesentery nodes
0.5 cm sub-capsular liver met removed
pT3 pN2b pM1
BRAF wild, KRAS G12D
7/9/18 CT no masses or enlarged nodes, 2mm indeterminate lung nodule
11/20/18 CT same, Lung nodule likely calcified granuloma. Enlarged spleen.
12/20/18 Liver MRI 5mm liver met and 2 lymph nodes in porta hepatis, CT review shows progression of nodes on FOLFOX