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 hemi
11 of 25 nodes,5 mesentery nodes
5mm liver met out
pT3 pN2b pM1
BRAF wild, KRAS G12D
7/18 CT NED
11/18 CT NED
12/18 MRI 5mm liver mass, 2 lymph nodes in porta hepatis
6/19 Multiphasic CT LNs normal, Liver stable
6/28/19 Pause Key, predisone for joint pain
7/31/19 Restart Key
9/19 CT stable
Pain: all fails but Celebrex
12/23/19 CT stable
5/19 MRI stable/NED