Var can and does shut down your own production of testosterone. If this happens quickly or at least early on in you var only cycle you will Be producing about as much test as a little old lady. This can lead to many issues. Most will suggest using test as a base in any cycle. You need to atleast replace what was shut down to continue to function like a man. This would mean a minimum of 250mg/week IMO and ideally 400-500mg/ week.