The American Diabetes Association and the Canadian Diabetes Association caution against treatments like the one peddled by the company Mr. Huckabee represents.

One ad arriving in January in the inboxes of Huckabee supporters, who signed up for his political commentaries at MikeHuckabee.com, claims there is a miracle cure for cancer hidden in the Bible. The ad links to a lengthy Internet video, which offers a booklet about the so-called Matthew 4 Protocol. It is “free” with a $72 subscription to a health newsletter.

Another recent pitch sent out to Huckabee’s supporters carried the subject line “Food Shortage Could Devastate Country.” It promoted Food4Patriots survival food kits, described as the “No. 1 item you should be hoarding.”

Although a disclaimer on the emails says Mr. Huckabee does not endorse these products, that might not be enough to dissociate him, as a future presidential aspirant, from their claims, which are designed to pry open the wallets of small-donor conservatives, some of whom distrust mainstream sources of information.