Citrus pectin

Homogalacturonan with a high degree of methyl esterification was the major polysaccharide in citrus pectin (88.6% galacturonic acid).
Patnode et al. 2019 Cell 179: 59-73

Citrus pectin increases the occurrence of B. thetaiotaomicron significantly.
Patnode et al. 2019 Cell 179: 59-73

GCS-100, is a modified citrus pectin.
Demotte et al., 2010 Cancer Res 70(19): 7476

see also:
Citrus peel