Stomach pains upset belly

So I’m taking sustanon 250 1ml every 2 weeks nhs approved as I’m on trt iv split it in to weekly dose

It is aspen sustanon 250 1ml it is arachis oil ( peanut oil refined)

Iv been fine on that no issues alight pip not bad

I thought about a 10 week blast of sustanon 250 1ml every week I could only sorce DUNNING LABS sustanon 250 not sure on the oil iv used it for 3 weeks and had very bad pip on it even bruising were iv pinned also had slight stomach cramps and upset belly so iv stopped it 1 week ago still getting upset belly

Can this be normal is it the oil any advice also not sure what oil is in it thanks :+1: