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<div id="main-content-wrap" class="main-content-wrap"> <nav aria-label="Breadcrumb" class="breadcrumb-nav"> <ol class="breadcrumb-nav-list"> <li class="breadcrumb-nav-list-item"><a href="hrtcat/topics.html">Topics</a></li> <li class="breadcrumb-nav-list-item"><span>Carrier Oils</span></li> </ol> </nav> <div id="main-content" class="main-content" role="main"> <h1 id="choosing-a-carrier-oil"> <a href="choosing_oil.html#choosing-a-carrier-oil" class="anchor-heading" aria-labelledby="choosing-a-carrier-oil"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Choosing a Carrier Oil </h1> <p>Most legal compounding pharmacies use castor, sesame, or sunflower oil.</p> <p>Most DIY brewers use MCT oil (AKA Viscoleo). MCT is more viscous and so absorption rate is thought to be quicker. However, its viscousness makes it easier to inject.</p> <p>We use MCT oil and feel that the trade-off is worth it. It may be absorbed faster by the body, but we like how easy it is to inject. Also, when combined with the long half-life of EEn or TC it doesn’t seem to cause issues for us.</p> <p><a href="https://groups.io/g/MTFHRT/wiki/29602">Lena</a> says:</p> <blockquote> <p>“MCT oil… made from a mix of C8 (caprylic) and C10 (capric) fatty acids (not C8 only)”</p> </blockquote> <p>This is like the MCT oil listed <a href="https://www.medical-and-lab-supplies.com/catalog/product/view/id/24082/s/mct-60-40-caprylic-c8-capric-c10-oil/category/2316/">here</a>, which is also listed as pharmaceutical grade. We haven’t researched the C8/C10 thing, but we will say that you should definitely get pharmaceutical grade if you can.</p> <p><strong>Some more info from <a href="https://transfemscience.org/articles/injectable-e2-meta-analysis/#data-quality-limitations-and-variability-between-studies">an article on Transfeminine Science</a>:</strong></p> <blockquote> <p>It is in any case known from other studies that different oil vehicles are absorbed at different rates from the injection site (<a href="https://doi.org/10.1111/j.1600-0773.1979.tb02404.x">Svendsen & Aaes‐Jørgensen, 1979</a>; <a href="https://doi.org/10.1016/S0378-5173(98)00121-5">Schultz et al., 1998</a>; <a href="https://doi.org/10.1016/S0378-5173(01)00860-2">Larsen et al., 2001</a>) and can result in different concentration–time curve shapes (<a href="https://scholar.google.com/scholar?cluster=7643602853178335452">Ballard, 1978</a> [<a href="https://archive.is/PbwqF">Excerpt</a>]; <a href="https://doi.org/10.1111/j.1600-0447.1985.tb08535.x">Knudsen, Hansen, & Larsen, 1985</a>). This is thought to be due to differences in oil lipophilicity and depot release rates. <a href="https://en.wikipedia.org/wiki/Viscosity">Viscosity</a> of oils has also been hypothesized to potentially influence rate of depot escape (<a href="https://doi.org/10.5414/cp201589">Schug, Donath, & Blume, 2012</a>). However, research so far has not supported this hypothesis (<a href="https://doi.org/10.1208/s12248-009-9153-9">Larsen & Larsen, 2009</a>; <a href="https://doi.org/10.1007/978-1-4614-0554-2_7">Larsen, Thing, & Larsen, 2012</a>). Oil vehicles can vary with injectable estradiol preparations even for the same estradiol ester. For instance, pharmaceutical estradiol valerate is formulated in <a href="https://en.wikipedia.org/wiki/Sesame_oil">sesame oil</a>, <a href="https://en.wikipedia.org/wiki/Castor_oil">castor oil</a>, or <a href="https://en.wikipedia.org/wiki/Sunflower_oil">sunflower oil</a> depending on the preparation (<a href="https://files.transfemscience.org/pdfs/docs/Injectable%20Estradiol%20Vehicles%20and%20Their%20Compositions%20and%20Properties.pdf">Table</a>). It is notable however that these three oils have similar lipophilicities (<a href="https://files.transfemscience.org/pdfs/docs/Injectable%20Estradiol%20Vehicles%20and%20Their%20Compositions%20and%20Properties.pdf">Table</a>). On the other hand, <a href="https://en.wiktionary.org/wiki/homebrew">homebrewed</a> injectable estradiol preparations used by DIY transfeminine people often employ <a href="https://en.wikipedia.org/wiki/Medium-chain_triglyceride">medium-chain triglyceride (MCT) oil</a> as the oil vehicle. This oil (in the proprietary form of <a href="https://en.wikipedia.org/wiki/Viscoleo">Viscoleo</a>) has notably been found to be much more rapidly absorbed than conventional oils like sesame oil and castor oil in animals (<a href="https://doi.org/10.1111/j.1600-0773.1979.tb02404.x">Svendsen & Aaes‐Jørgensen, 1979</a>; <a href="https://doi.org/10.1016/S0378-5173(98)00121-5">Schultz et al., 1998</a>; <a href="https://doi.org/10.1016/S0378-5173(01)00860-2">Larsen et al., 2001</a>). In addition, although based on very limited data, MCT oil has been found to give spikier and shorter-lasting depot injectable curves in humans (<a href="https://doi.org/10.1111/j.1600-0447.1985.tb08535.x">Knudsen, Hansen, & Larsen, 1985</a>). As such, injectable estradiol preparations using MCT oil as the vehicle may have differing and less favorable concentration–time curve shapes than pharmaceutical injectable estradiol products. Other excipients, like <a href="https://en.wikipedia.org/wiki/Benzyl_alcohol">benzyl alcohol</a>, as well as factors like injection site and volume, have additionally been found to influence pharmacokinetic properties with depot injectables (<a href="https://jpet.aspetjournals.org/content/281/1/93.short">Minto et al., 1997</a>; <a href="https://doi.org/10.1016/j.ejps.2015.12.011">Kalicharan, Schot, & Vromans, 2016</a>). Excipients besides oil vehicle also vary by formulation (<a href="https://files.transfemscience.org/pdfs/docs/Injectable%20Estradiol%20Vehicles%20and%20Their%20Compositions%20and%20Properties.pdf">Table</a>).</p> </blockquote> </div> </div> <div class="search-overlay"></div> </div> </body> </html>
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