Not sure - those are FDA requirements - OSHA MSDS filings apparently allow the use of percentages, FDA requires weight or volume.
I'm still confused about the language on Hikma's label - it says 1 g capsule in several places (as does V's label), but clearly these capsules are 1.4 g or 1.5 g - huh? This is from Hikma label:
DOSAGE FORMS AND STRENGTHS
Icosapent Ethyl Capsules are supplied as a 1 gram, clear, oblong capsule with product identification “54 648” on one side.
DESCRIPTION
Icosapent ethyl, a lipid-regulating agent, is supplied as a 1 gram, liquid-filled soft gelatin capsule for oral administration.
Each capsule contains the following inactive ingredients: gelatin, glycerin, purified water, sorbitol, sorbitan and tocopherol. The monogramming ink ingredients contain: ammonium hydroxide, iron oxide black, isopropyl alcohol, macrogol, polyvinyl acetate phthalate, propylene glycol, purified water and SDA alcohol (ethanol and ethyl acetate).
Description on V label for inactive ingredients says this - no sorbitan:
VASCEPA capsules also contain the following inactive ingredients: tocopherol, gelatin, glycerin, maltitol, sorbitol, and purified water.