As far as the shelf life, most oils will be 6-12 months, depending on the oil, preservatives, and storage. I've also heard that grapefruit seed extract is a great preservative, significantly extending the shelf life, likely due to high antioxidant activity.
The problem with oil is that it goes rancid slowly over time. This process results in production of free-radicals, which are damaging to our bodies. Injecting rancid oil would likely cause more inflammation than normal, but would likely not be toxic unless under extreme conditions.
I'm guessing refrigeration, though it would slow the process og going rancid, is a no-no? Is there a way to determine if the oil is rancid?
The stuff ive got i brewed about 4 months ago, so no worries at the moment, just wondering how to tell when its time to pitch it... the test e powder had an expiration date of 11-2008, but im guessing that because of the oil, it's not going to last that long. I spaced out and dumped all 20 grams of powder in at once, instead of the 10 I had planned... DOH!!!
And at what stage does one use the grapefruit extract, and how?
Thanks again for your responses.