Octyl Salicylate

**Alpha Dog** · 10-06-2002 10:41 PM

So, why isn’t anyone discussing using Octyl Salicylate in their transdermal homebrews? Octyl Salicylate has been proven to be an effective penetration enhancer when used with Testosterone. In the attached study, OS was shown to increase the penetration of testosterone by a factor of six. That is a huge number. In addition, it is the first ingredient that Par discusses in his transdermal article. Granted, its not cheap. I paid $30 for 500 ml’s. Its not often that we have solid evidence (or studies) relating to the transdermal absorption of hormones with various penetration enhancers. We do have it with OS. The attached article from Science Magazine is very interesting.

http://www.science.com.br/artigos_pd...Permeation.pdf

**curt2go** · 10-06-2002 11:01 PM

I have had this discussion with a few people before. I don' tlike OS. The reason is that there is only one article that says it penetrates well(This one you show is the same one and only one that Par uses for his backup of OS).. There is way to many articles like this one I have posted that say it does nothing. OS is a UV ray blocker and thats all I have found. But lets definately keep looking. The homebrew will never be "perfect" and can always be improved. Talk to ya.

2-Ethylhexyl Salicylate (aka octyl salicylate) is an FDA-approved sunscreen for UVB absorption.

Walters, K.A., K.R. Brain, D. Howes, V.J. James, A.L. Kraus, N.M. Teetsel, M. Toulon, A.C. Watkinson and S.D. Gettings. Percutaneous Penetration of Octyl Salicylate from Representative Sunscreen Formulations through Human Skin In Vitro. Fd. Chem. Toxic. 1997. 35: 1219-1225. [Reprinted with permission from Elsevier Science]
octyl salicylate - 06969-49-9
The human skin penetration of [14C]octyl salicylate from two representative sunscreen vehicles was determined in vitro. 3H-sucrose was incorporated into all formulations and provided a marker for membrane integrity. When applied as a finite dose in an oil-in-water emulsion vehicle containing 5% (w/w) octyl salicylate, the average total absorption of 14C over 48 hr was 0.65 ± 0.16% of the applied dose (representing a total amount permeated of 1.58 ± 0.36 ug/cm2). When applied as an infinite dose in the oil-in-water emulsion vehicle the average total absorption of 14C over 48 hr was 0.47 ± 0.22% of the applied dose (representing a total amount permeated of 27.54 ± 13.91 ug/cm2). When applied as a finite dose in a representative hydroalcoholic formulation containing 5% (w/w) octyl salicylate, the average total absorption of 14C over 48 hr was 0.23 ± 0.05% of the applied dose (representing a total amount permeated of 11.28 ± 2.55 ug/cm2). The penetration of [14C]salicylic acid [applied at a concentration of 2.7% (w/w), in the oil-in-water emulsion] was also determined. When applied as a finite dose the average total absorption of 14C over 48 hr was 1.14 ± 0.23% of the applied dose (representing a total amount permeated of 1.65 ± 0.39 ug/cm2). These results suggest that the in vitro human skin permeation of octyl salicylate is relatively low. The amounts of octyl salicylate and salicylic acid permeated when applied in similar vehicles were remarkably similar over 48 hr (1.58 ug/cm2 and 1.65 ug/cm2, respectively). This suggests the possibility that the 14C label appearing in the receptor fluid may, in both cases, represent salicylic acid. If this is the case, then it is possible that the amount of octyl salicylate permeating through the skin is much less than that suggested by the data obtained here. This supposition is, however, entirely speculative and has yet to be confirmed experimentally.

**curt2go** · 10-06-2002 11:02 PM

PS I can get more like this one if you like .. Talk to ya..

**Alpha Dog** · 10-07-2002 10:52 AM

Curt, thanks for the quick response. Do you have any similar studies that use sex hormones or something similar to testosterone? The reason being is that 3H-Sucrose may not be very representative of testosterone in terms of molecular weight, solubility, polarity, etc. These are all factors that are very important to the absorption of a drug through the skin.

**curt2go** · 10-07-2002 10:55 AM

The only on eI have ever seen in sex hormones is the ONE you have. And I think that is the only one. I definately don't like that there is only one study. I will try to do some reserch... Talk to ya.

**Alpha Dog** · 10-07-2002 10:59 AM

Science is a very respected pub and usually does not publish junk. In addition, 1 study in favor using test is more research than some of the other ingreditents that are being used. But I agree, it is still not a lot to go on.

**curt2go** · 10-07-2002 11:02 AM

No I totaly realize that. I just don't like the fact that thers is only one. Thats all. Talk to ya

**curt2go** · 10-07-2002 11:08 AM

Originally posted by bow
Curt, thanks for the quick response. Do you have any similar studies that use sex hormones or something similar to testosterone? The reason being is that 3H-Sucrose may not be very representative of testosterone in terms of molecular weight, solubility, polarity, etc. These are all factors that are very important to the absorption of a drug through the skin.

If thats the case then this test was done with test. We do not use test in the solutions. 1-test and 4-ad . These different in molecular structure and weight from the study as well. Just food for thought. talk to ya

**Matt T** · 10-09-2002 02:52 PM

Originally posted by curt2go

If thats the case then this test was done with test. We do not use test in the solutions. 1-test and 4-ad . These different in molecular structure and weight from the study as well. Just food for thought. talk to ya

but the weights are simililar enough, and the structures are based on the sterol structure.

**curt2go** · 10-09-2002 03:18 PM

Yes i realize they are close but not the same thats all. the test was based on test and its the only study out there.. If we can find that it works then cool. But one other thingwe don't want the brew to get too complicated and expensive. If we find it to be good and works diff from the other pe's then we can add it but if it works by the same action as one of the other pe's then there is no sence to add it. Talk to ya.

**curt2go** · 10-09-2002 03:20 PM

Originally posted by Matt T

but the weights are simililar enough, and the structures are based on the sterol structure.

Ps speak english on this board please we want everyone to understand everything. We don't want ot be like par who talks over people instead of to them .... Thanx ...heheheh

**Matt T** · 10-09-2002 03:22 PM

Originally posted by curt2go

Ps speak english on this board please we want everyone to understand everything. We don't want ot be like par who talks over people instead of to them .... Thanx ...heheheh

what did you expect from a thread entitled octyl salicyate?

**Chemo** · 10-09-2002 04:21 PM

Originally posted by Matt T
but the weights are simililar enough, and the structures are based on the sterol structure.

By sterol you are referring to what?

Chemo

**Matt T** · 10-09-2002 05:10 PM

Originally posted by Big Daddy Chemo

By sterol you are referring to what?

Chemo

cholesterol-based (steroid) molecules

i realize the problem, sterol refers to plant derived steroids, right?

**curt2go** · 10-09-2002 05:16 PM

Originally posted by Matt T

what did you expect from a thread entitled octyl salicyate?

Good point but most people that have been following homebrews know what octyl salicyate is OS.. talk to ya...

**DevilSmack** · 10-16-2002 02:31 PM

Where can I buy some OS. Melissa at LemeLange has been having problems getting it for me.

**ShadowJack** · 10-16-2002 03:58 PM

Originally posted by DevilSmack
Where can I buy some OS.

Try theeyeofnewt.com. Here's a link direct to the product page:

http://www.theeyeofnewt.com/store/ht...cylate_usp.asp

**Alpha Dog** · 10-17-2002 01:05 AM

Originally posted by Matt T
what did you expect from a thread entitled octyl salicyate?

Sorry. In retrospect I should have named the thread

"Yo Homies, what about out this sh*t?"

**ndn diablo** · 10-17-2002 06:49 PM

OS seems to be an effective PE for the reason that it can open up the layers on the SC. Not to mention we have definite proof that it works with hormonal compounds (study bow posted). Heres what Par had to say about it in his article:

The second mechanism is via disruption of the stratum corneum's highly ordered lipid bilayers. As we described earlier, it consists of lipophilic lipid regions, each separated by a thin layer of water. This aqueous layer is detrimental to the diffusion of lipophilic substances. Certain penetration enhancers such as unsaturated fatty acids, padimate O, and possibly isopropyl myristate and octyl salicylate, can disorder these bilayers, forming separate pools of oil within the stratum corneum's intracellular spaces, which lipophilic compounds can diffuse through much more freely (3,19,20). This would also be expected to help hydrophilic compounds, if aqueous pools were formed, and there is data suggesting both the capability of "straight through aqueous channels" (21), as well as enhancement with a combination of propylene glycol, which is hydrophilic, and unsaturated fatty acids

**DevilSmack** · 10-17-2002 06:50 PM

Thank's shadowjack.

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