Mastic gum was a chewing resin long before it was a capsule ingredient, and a 120 capsule bottle still asks you to swallow it whole. The form changed and the ingredient didn't, which leaves the obvious question sitting there unanswered on most labels.
What mastic gum is before it's a supplement
It's a resin, the hardened sap of a tree in the pistacia family, harvested as tears that get cleaned and dried. Chewing is the traditional use. A resin is meant to be worked in the mouth, releasing what it holds over minutes rather than in one gulp, and a capsule is designed to skip that entire stretch of time.
That physical behaviour is the reason the chew question keeps coming up. The material was never a powder you chase with water. It was something you worked between your teeth until it gave up what was inside it, and the modern formats each make a different compromise with that history.
Why chewing was the original delivery
Two things happen while you chew that a swallowed dose skips. Contact time in the mouth goes from a few seconds to several minutes, and the material arrives in the stomach already softened and already mixed with saliva.
Whether either of those differences matters downstream is not something a supplement label can answer, and I won't pretend otherwise. What the label can tell you is which form asks for the chew and which one removes it, and that is the decision actually in front of you.
What a capsule does instead
The mastic gum capsules run 2 capsules daily and hold 120 of them, a 60 day supply. Swallowed whole, the resin enters the stomach as a powder inside a shell, so the mouth step is gone and what reaches the stomach arrives at once rather than gradually.
That isn't automatically worse. It's different, and for plenty of people the difference is the point: no taste, no jaw work, nothing stuck in the teeth. Convenience is a legitimate reason to pick a form, and a dose you actually take beats one you abandon after four days.
Where the milligram numbers are printed, and where they aren't
Here the labels get interesting, and not in a reassuring way. The DGL gummies with zinc carnosine print 1,050 mg of DGL root extract, 75 mg of zinc carnosine and 100 mg of L-glutamine in a serving, with 2 gummies after meals as the instruction. The capsule bottle prints no milligram figure for the mastic gum, the zinc carnosine or the L-glutamine at all. The mastic gum gummies name three ingredients and give 90 to a bottle, quantifying none of them.
So the honest comparison across these three isn't milligram to milligram. It's form to form, and the resin amount is the single number none of them hands you. If a brand does quantify it on the carton, that's worth more to you than any of the marketing copy above the fold.
Choosing between a chew and a swallow
Ask which step you are trying to keep. If you want the resin worked in the mouth, you need a form you chew, and a gummy is the only one of the three that asks for that. If you want the material in the stomach without tasting it, the capsule does exactly that, and it also happens to be the format that carries the longest supply per bottle.
The gummy route brings its own companions along. A chewable in this category tends to arrive with DGL licorice and slippery elm type botanicals in the same serving, which changes what you are comparing: not resin against resin, but one whole formula against another. The mastic gum supplement shelf splits along that line, and the zinc carnosine and DGL licorice collections overlap it heavily, because most formulas carry two or three of these at once.
Does chewing mastic gum matter?
Traditionally yes, since chewing is how the resin was used for centuries. Whether a swallowed dose does the same job isn't settled by anything a label shows you.
How many milligrams of mastic gum am I getting?
No listing here prints one. The DGL gummies print 1,050 mg of DGL and 75 mg of zinc carnosine, but the resin itself goes unquantified on all three bottles.
Should I take it after meals?
The DGL gummy label says 2 gummies after meals, and the capsule label says 2 capsules daily. Follow the bottle you bought rather than a general rule.