My husband is currently on a TRT dose of 125mg / week of Test-E. He recently ran out of his original vial (source #1) and started using one from source #2. The new source uses MCT oil (we think -- it's clear, but we're waiting for confirmation from him) and the original used GSO (yellow tint to the oil). Over the past couple of weeks, he's been having some intense bathroom issues (basically very frequent diahrea). This morning, he realized he thinks symptoms start the day after pinning.

I've used test from this source without issues before, so I am wondering if he's just having a poor reaction to the MCT oil carrier. Has anyone heard of something similar? I am going to start homebrewing soon and this clearly makes me reconsider using MCT oil in our Test E brew. We do have a vial of GSO test-E that I recently acquired, so he's going to try that in the meantime. Absolutely no other symptoms (no fever, irritation, bruising, etc), so it's not an obvious injection issue.