I was diagnosed with LADA type 1 over 5 years ago. I am very chemically sensitive and do not tolerate medication well. Early this year I went through a lot of allergy testing and found that I am allergic to glycerin and glycerol. Glycerol is in virtually every longer lasting (basal) insulin, and Glycerin is in all mealtime (short acting) insulins. I have tried every brand, and feel sick on all of them--headache, negatively affects by breathing, post-nasal drip. The allergist tried desensitization, it didn't work, or didn't work enough. I've even tried the newer concentrated form of Insulin Glargine (Toujeo) and Humalin R U-500. These seemed like they might be the answer because you only get 1/3 (for Toujeo) or 20% (Humalin u-500) of glycerol or glycerin for the same amount of insulin, but I still have a constant, intense headache.. I have tried experiment after experiment for the last 6+ years, nothing works, and the doctors don't know what to do either. I'm told I "must" have the drug, and need to figure out how to tolerate the side effects. Anyone else have this problem, or find a solution?