Something I found is that Reta works far slower initially than Tirz or Sem. I found for me, Reta didn't really work at all. 3 different vendors. However Tirz worked perfectly. However for my mom, the Reta worked just fine. (to be fair shes diabetic)... she got the same batch I did. There are a couple of doctors on youtube who explain why this happens.
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NotThatCreative
@NotThatCreative