The stimulatory effect of grape extracts assayed could be affected by composition and phenolic profile. Both grape pomace and grape seed extracts have a similar phenolic profile but they differ in extractable polyphenols content (19.60 ± 1.59% for grape pomace
extract and 69.38 ± 0.77% for grape seed extract). Thereby, the difference in the lactobacilli response could depend directly on extractable polyphenols content in grape extracts