Three small glasses of wine a day would be 21 units a week. As one example, Canada's existing guidelines at 15 drinks a week max for men and 10 drinks a week max for women before you hit material negative health consequences, and more recent research is likely to update those guidelines as it's been shown that intake at lower levels than 15/10 is still harmful. The newly proposed guidelines are two drinks a week, regardless of gender, noting that women are more impacted by men as you exceed 2/week but that both will experience meaningful statistical harm including meaningful increases in certain cancers (like breast and colon for example).

https://ccsa.ca/sites/default/files/2022-08/CCSA-LRDG-Update-of-Canada%27s-LRDG-Final-report-for-public-consultation-en.pdf