 [ Symptoms ] my grandson age 10 months penis hardly visible testicle size normal is this cause of concern and further investigation [ Disease ] chewable is chewable and sublingual is sublingual they are not the same sublingual literally means under the tongue  some medications and apparently supplements are given this way because the tissue under the tongue is rich with blood vessels which allows for rapid absorption of the active ingredient of the medication or supplement chewables on the other hand get ground up a little bit and then swallowed into the stomach because a chewable medication or supplement has been ground up by the teeth and the salivary glands have been able to begin breaking the pill down with enzymes the chewable product probably gets absorbed in the stomach slightly more quickly than a pill swallowed whole wishing you well