بسم الله الرحمن الرحيم
(1) If you don’t know what types of gelatin is used to prepare the cover of capsule then it is better that you avoid using such capsule, specially when the other alternate medicine is available. The Shariah ruling related using the gelatin has some details. Two detailed fatwas are available in “Chand Ahem Asri Masail” Vol 2, pages: 324-334. Some details are also available in “Fatawa Usmani” Vol 4, pages 333-338. You may read it.
(2) For Halal Companies, consult the local concerned persons.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.