I think you can find that kind of info on Novo Nordisk's FDA approval submissions for the liquid inject pens. It generally matters more how they were kept than the length of time. So, one day in the heat and light out for delivery then a hot mailbox for a day until you come home from your booty call the next day could mean you lost 50% of the purity. The mechanical force, the heat, humidity, light, and the exposure to airborne bacteria to a lesser degree all make these acceptable to sell at brand name within a 15% dose on label versus as it shows up for most biologics, actually. if you have it in a closed, clean lid with surfactant agent or humidity controlled 2-6 Celsius cooler they might be fine. The bigger problem in years on the shelf is whether the production batch you received had much residue of e-coli or anything that could wind up causing some hGH autoimmunity. But head to head Pfizer versus Novo Nordisk the pens were more tightly controlled, the liquid carried less unwanted bacteria or foriegn cellular waste and maintained purity and potency AND distributed the liquid more efficiently for Novo pens in a study on 30 days unrefrigerated aqueous pens from both manufacturers. Kids had Turner syndrome and later down the line one developed some resistance to the residue from the attachment terminals where e-coli bank bits of DNA occasionally are present in tiny amounts. That was an outlier and a compromised population.

If it were me I would sell as many as you can for just below the going rate, buy newer ones from the closest and quickest to ship them to you carefully, and use as many as you have to of the old batch but watch for red lumps and maybe consider what your time frame and money situation is. I am pretty risk intolerant and say unless these sat on your window sill you should get results. Yes, buy the EZ inject twist on caps if you want - amazon even has knock offs. but insulin needle in the cork end works fine too. the clicks are necessary for the official needles only, and don't precisely measure the dose so you'll have to convert the 15 mg/1.5mL to 10mg/1mL, leaving you with 11IU per 10CC notch on a 100 CC 1 ML insulin needle. Check my math though bud. generally these got about 3.33IU per notch per mg, I think.

Feel free to send them to me and i'll tell ya...jk they should be fine imo

When did they expire? Recently? then I wouldn't worry about it if they were stored properly. If your using a slin pin then just draw from the end. No need to click. That's only if you are using pen needles.