Transglutaminase (TG)—or meat glue, as it’s commonly called—is a widely used ingredient. However, it’s a controversial food additive. Indeed, in 2010, the European Union banned its use.

But the active ingredients in each are different. Allegra contains fexofenadine and Claritin has loratadine. If you have seasonal allergies (hay fever), you know all about the aggravating symptoms ...