Did you even try searching for studies before the comment?  There are also several good references below the article. "In summary, we have demonstrated that oral delivery of vitamin C encapsulated in liposomes (1) produced circulating concentrations of vitamin C greater than those elicited by oral delivery of unencapsulated vitamin C but less than those following intravenous vitamin C administration and (2) provided protection from ischemia–reperfusion that was similar to the protection provided by oral unencapsulated vitamin C and intravenous vitamin C administration." https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4915787/