Long time old post --
Waking the Dead on a Question
This day error of Testosterone Brands
Witch brands use Castrol oil ?

I’ve tried everything I’ve read about to avoid Pip and still no relief. The only thing I can think of is that I may have an issue with the carrier oils. I’ve heard good things about mct oils as opposed to grapeseed, cottonseed etc. Does anyone have a recommendation for where to get products that utilize mct oils? And what brand and type of test to acquire? I Appreciate any help getting products with mct oils. I typically go to osgear.

Personally MCT works better for me. Thin oil and easy to go in

Everything you need to know about oil carriers can be found in these posts. It also explains why people using certain carrier oils get massive pip and a lot of irritation, also as of late mct oil is the preferred carrier alongside grape seed oil due to its very low irritant and its anti bacterial properties. my TRT carrier is gso unless I switch to another pharmacy and it ends up being mct. I have not had pip in over a year now since changing to a new provider. my new protocol is 100mg every 7 days.

https://www.scienceandhumans.com/testosterone-cypionate-versus-testoster...

https://old.medicalhealthinstitute.com/best-oils-to-use-when-injecting-t...

https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=6909596e-...

https://www.sciencedirect.com/science/article/pii/S0928098722001385

Knowledge is power. Happy reading.

I dont know if it changes the half life, once the compound is absorbed it does its thing. i think a carrier oil can effect the time frame that it takes to get absorbed into the body, same with where you inject and how much you inject. A larger amount, think big oil bubble, will take longer to be absorbed. Then there's sub-q vs IM injections, absorption into fat vs muscle.

MCT always worked best, however there are tricks of the trade when brewing, how is no one saying anything about the quality of R*ws? GSO I would say would be 2nd best in my experience. Also higher mg means different carriers also due to the break down your body has to do.

According to Bayer, castor oil does increase the half life of Testosterone Undecanoate quite a bit, which is why they use it for Nebido with low solvents.
I read some studies on it years back and I'm sure you can find them easily, just search for testosterone undecanoate cast oil half life ncbi.

So absorption kinetics are affected by the viscosity of the oily vehicle, concentration in the ester, (the higher the driving diffusion force for release), the volume of the product, and the site of injection.
This was commented by @Serrajitsu0876. I do remember seeing something similar to this long ago.
I commented on ester, inject location and viscosity of oil earlier. Thanks Serra

+1 @TheIcon hey man I liked the Scot Steiner reference as well as this post. Even though guys may disagree no one here is for certain lol. Only a lab test would know answer. But what was your opinion? Maybe I looked over it. What do you think? You must have an opinion

This is something I wouldn't bother concerning yourself with at all, choose the carrier oil that you feel healthiest on and well/clear headed. That will make a bigger difference as to how you feel throughout the cycle more than if a certain carrier oil shortens a compound by half a day or so. Case in point - I've tried many Test props over the 9 years I have run steroids and I never notice which ones seem to clear quicker than others, its just not something you notice. What I can tell the difference on is which come into play quicker than others, some will take 6 hours and some take up to 12. Even then though when comparing say MCT, GSO, Miglyol, Sesame seed etc there is no consistency to it. It leads me to believe that the actual RAW compound can vary more in activity time than the carrier oil, as effectively they are all propionate estered so should all behave in the same way - but they don't.

Gso or bust.

So there has always been a debate about this issue. In my opinion I do think that a carrier oil can affect the breakdown time of an oil, hence the slower or more sustained the breakdown of oil, the increase in half life to an extent. Both myself and
@Lil-Beirut both seem to notice a small difference. We both prefer GSO not MCT oil. Like explained below MCT oil dissipates the fastest leaving the hormone which is sometimes crystallized therefore causing pip, so that's what @Makwa was explaining. An oil like say GSO or a thicker oil will indeed remain a little longer acting as a buffer like Makwa said. Someone mentioned castor oil too, well there's a reason why pharmaceutical companies use it with the long acting Undecanoate ester. Long ester that's supported by a thicker oil makes longer half life. Now I see Test U in Mct oil which is a bit strange. I'd like to know the true difference between both in half life. Both are undecanoate.

My memory is fuzzy so anyone please correct me but esters are broken down by esterase enzyme and fats by lipase enzyme. In order for the oil depot to be broken down completely the lipase brakes down the oil while the ester enzyme cleave the ester leaving the base hormone to be used by the body. Just a simple explanation as I'm no expert though. But in my opinion I do feel a slight difference in longevity, with MCT oil lasting the shortest time. But maybe one of you geeks can explain this better to me lol.