last summer my HRT stopped working, I started waking up at night with a racing heartbeat again and I was worried that I was back to terrible broken sleep. I started keeping the gel in the fridge (threw the old one away), and it’s been fine since. The last few days I’ve been travelling, and could not keep the gel in the fridge, and after two days I started waking up in the night again just like before HRT. It doesn’t say anything about storage temperature on the information sheet, but I think my criteria for scientific rigour have been met and I’ll be buying one if those chilled bags people use for insulin. I hope this can help if anyone else is struggling!