The phrase "as is often mentioned" is correct and usable in written English.
It can be used to refer to a common point or idea that has been frequently discussed or acknowledged in a particular context.
Example: "As is often mentioned, regular exercise is essential for maintaining good health."
Alternatives: "as is frequently noted" or "as is commonly stated".
As was often mentioned when Beckett went out for Game 6 of the World Series in 2003, pitchers throwing on abbreviated zzz's in the postseason were 6-20.
As well it is often mentioned as the preferred animal species for organ xenotransplantation [ 1, 2].
Mr. Cuomo, a Democrat who has generally avoided national politics even as he is often mentioned as a potential candidate for president, offered an enthusiastic endorsement of the benefits of the health care measure, which is currently being litigated before the Supreme Court and contested in this year's presidential campaign.
The pope is expected to appoint as many as 25 new cardinals as early as February, and Archbishop McCarrick is often mentioned as a strong candidate, as are Archbishop Egan and Archbishop Justin F. Rigali of St . Louis
He is as important to the Yankees as Justin Verlander, who is often mentioned as a leading candidate for most valuable player, is to the Detroit Tigers.
Since taking office in 2011, Mr. Cuomo has largely shied from the national — not to mention international — stage, even as his name is often mentioned as a Democratic presidential candidate in 2016.
Patrick, who chose not to run for a third term as governor this year, is often mentioned as a potential Democratic presidential candidate.
A scion of two dynasties of Moroccan Jewish scholars who were revered as mystics, Rabbi Pinto is often mentioned as a candidate for chief rabbi of Israel, where he first established his congregation, Shuva Israel.
On a larger scale, the election was widely seen as an opportunity for Mr. Miller, who is often mentioned as a rival to the mayor in 2005, to demonstrate his leadership, solidify his base of support and raise his own profile.
Chinese-English language textbooks consider herbal remedies as the primary treatment method in children, 31 followed by Tui na, although acupuncture is often mentioned as an adjunct treatment.
