<prompt> Translate the following text to EnglishHakika makampuni makubwa ni zaidi shy katika pitches yao - Hall ya Zinc Defense sanduku anasema zinki inaweza kupunguza dalili za baridi na, katika maandishi madogo, anakataa kufanya madai yoyote ya kutibu hali ya afya - lakini kwamba tu hufanya udanganyifu ufanisi zaidi.  <response>: Sure the big companies are more coy in their pitches--the Halls Zinc Defense box says zinc may relieve cold symptoms and, in small print, denies making any claim to treating a health condition--but that only makes the sham more effective. 