I have a question - actually never thought about it before - we all agree on the idea of splitting your var dose in half during the day because it has a half life of about 8 hrs - evens out the content in your body. The half life of primo is about 5 days. Any big deal if you are doing short daily doses? A typical primo inject cycle is some amount say 50-150 mg (depending on how aggressive you are...) e5d, which would match w/ the half-life idea.