But, in recent years, researchers have also discovered that alpha-gal is in tick saliva. And, for reasons researchers still haven't worked out, some people bitten by ticks develop a type of antibody called anti-alpha-gal IgE. This antibody may help protect people from tick bites, but it also renders them allergic to anything with alpha-gal—i.e., mammalian meat and animal products. It's a double-edged sword that has been hypothesized to be an "allergic klendusity."
I found a chart from Alpha-Gal Information that lists the products that those with alpha-gal syndrome might have allergic reactions to; of note is that some have reactions to gelatin, which is present in many medicines including gel-caps.