The makers claim that these sure-to-be-effective cookies could boost busts by a whole cup size, if you eat just two a day.
Each biscuit contains 50mg of a herb called Pueraria Mirifica, which, according to the makers, apes the effect of oestrogen and increases breast tissue.
However, experts have warned that the herb has not been medically proven to work.
"These types of herbs are associated with similar risks as oestrogen-containing birth control pills or hormone replacement, The Sun quoted leading British plastic surgeon Dr Rob Oliver, as saying.
The F-Cup Cookies cost 1.50 pounds for four but can only be bought in Japan or online.