Honestly, from my perspective, never more than 2ml in the large muscles and never more than 1ml in the small muscles.Anybody knows what the maximum recommended volumes are for each individual injection site per week?
And leave at least 3-4 days before re-injecting the same area (I still prefer to let it rest for a week.)
Also listen to your body, if you see that 1ml gives too much pip or inflammation, inject less the next time and the rest elsewhere. Small volumes, injected frequently in the most possible spot