I remember Denkal T-400 back in the day used to leave you limping. I can't imagine 500mg/ml. I'll take 2ml's of 250-300mg/ml and comfort over super potent brands any day.
I've used GDs (PL)400 and only would get a small sore spot now and then .
300 usually seems a sweet spot for high mg without high pain in my exp.
Have used one suppliers 350 and it was great. Potent and painless.T
I agree.
What's the point injecting something that will cripple you and you'll be sore and have a huge lump for a week.
250-300mg the highest I would go.
IP's DK T400 - 400mg/ml is the only high dose test I would trust.
The rest UG labs that claim 500mg+ I wouldnt feel comfortable with dosage, quality or pain factor.