expiration

So I'm going on 6 months of using a vial. Since I only inject ~80mg/week, it takes forever to get through a 10ml vial. On my most recent TT/FT test, my levels had quite a significant drop off without a change in dosage. There seems to be no general consensus on expiration on a vial once...

I have some injectable glutathione (preserved in benzyl alcohol) that I got prescribed last year. It’s from Empower Pharmacy, and unopened. Is it safe to use it if it says it was “expired” in December last year? Is that a real true “expiration” date?

What's the opinion on Testosterone shelf life for opened vials.... ? I was thinking of giving Test Prop a try again and have 90-95% full vial from Empower that was opened about 13-14 months ago....(it was stored in dark, dry place, the color and consistency still looks like new). Any thoughts?

Looks like Bharat Serums offers it now under the brand name Hucog. Anyone used it? I imagine once you break the seal, it's got the same 30-day expiration clock. But apparently it's shelf stable before then?