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Testosterone shown with Undecanoate ester
(Testosterone + Undecanoate ester)

Manufacturer: Organon
Effective dose: 600mgs
Active Life: less than 8-12 hours Detection Time: 4-5 weeks
Anabolic/Androgenic Ratio: 100:100
Andriol is testosterone with the undecanoate ester attached, and produced in oral form. It represents the first real attempt to create an oral testosterone since Methyltestosterone. It can be assumed that the scientists responsible for this wanted to create a viable alternative to both injectable testosterones (which, at least for Hormone Replacement Therapy, is inconvenient), as well as other oral forms of testosterone (which have traditionally been very harsh on the liver). What they came up with has proven to be a very odd steroid in many ways.

To create Andriol, the scientists involved came up with a solution to the problems facing methyltestosterone, namely the fact that it is harsh on the liver and needs to be taken in very high doses to produce decent results. What they did was put 40mgs of Testosterone Undecanoate in oleic acid (an oil), and encapsulate it. Now they use castor oil and propylene glycol laurate instead of oleic acid, but that only increases the shelf life, and doesn’t do anything else. After you put some testosterone undecanoate in caster oil and propelyne glycol laurate, you’ll have a testosterone which is highly fat-soluble due to the (very large) undecanoate ester attached to it, and able to be absorbed through your small intestine via the lymphatic system. What this means is that it avoids the “first pass” through the liver. A process which could destroy much of the active steroid, and place an undue amount of stress on the liver. It also displayed a rapid absorption and turnover it a study (11), which may account for its ability to not cause unwanted side effects. It’s not bad for your blood pressure (13), and also has no adverse effects on the prostate and may even improve blood pressure (12)! Thus, Andriol is remarkably light on all side effects, especially those related to liver toxicity and estrogenic sides. In this study, done with women, it even displayed no ability to lower LH and FSH (Leutenizing Hormone and Follicle Stimulating Hormone, respectively), which are the hormones that tell your body to make more testosterone (11). I doubt Andriol could be properly regarded as liver toxic or too damaging to your HPTA (Hypothalamus¬¨Pituitary-Testicular-Axis, the thing that governs your body’s production of testosterone, among other things), at any kind of reasonable (or even excessive) dose. Actually, one study noted no adverse reactions or effects at all with the use of Andriol (10). As for your lipid profile and cholesterol, it has even been shown to have beneficial effects on them (14)!

Putting some Testosterone Undecanoate in Gel Caps is what the scientists at Organon have done with their Andriol product looks good so far. The active steroid totally bypasses your liver and hence doesn’t get damaged by or damage your liver, and gets a bunch of Testosterone into your body. Unfortunately after the lymphatic system has brought the testosterone undecanoate into circulation in your body, the undecanoate ester begins to be removed. This would leave you with (roughly) 25mgs of testosterone in your blood stream, as the decanoate ester takes up a lot of “space” and the cap only contains a total of 40mgs of testosterone undecanoate (roughly 15mgs of which are ester). The end results from Andriol would be very similar to the end result of injecting almost any form of testosterone (4), once your body removes the ester. But remember, you’d never inject 25mgs of testosterone suspension and call it a day, but that’s exactly what you are doing when you take only one Andriol cap.

At the end you have 25mgs of testosterone floating around in your body. That’s not much, so if you’re realistically considering using this product, you’ll need to take quite a few caps of it. And there’s one of the first problems we encounter with this drug. The method of administration of this drug provides us with a nice liver-safe product, but this stuff will peak your testosterone levels within around 2 hours after administration, and will only remain (at least slightly) elevated for 10 or so hours (1). Ideally, you’d be taking a capsule every 2 hours, which is inconvenient to say the least. Let’s be generous and say you can simply take one every 4 hours. Problem solved? Not really, because we’re going to need to take at least 2 caps with each dose if we want to see any sort of anabolic effect, and if we’re taking it every 4 hours (assuming we’re awake for 16hrs every day), then we’ll be taking around 8 caps per day. Now we’ve shifted the problem away from the effort needed to take an effective does to being a problem with economics. The problem with this type of dose is going to be cost. Andriol is pretty expensive to be taking in the amount of 8 caps per day, and I have never seen it made by anyone except for Organon, which means we won’t find it on any Underground Labs product lists. That means we need to pay whatever price Organon is asking, and they are asking a lot. You can easily run a cycle with several anabolic compounds for the price of a cycle of just Andriol.

So that’s our major obstacle, the expense of taking Andriol in what would be an effective dose is prohibitive to most people. One study noted that Andriol therapy, when compared with traditional Testosterone injections is roughly 7-8x more expensive (5).

Cost notwithstanding; let’s see what kind of results we can expect from Andriol (besides the catabolic effect it will have on your wallet). Although it has a reputation for being very mild, you’ll still see some results from Andriol. One study using a very low dose on adolescent boys still showed a reasonable gain in Fat Free Mass (3) even though the boys were not training. Another study focusing on the elderly, improved their quality of life considerably (as androgens often do) (6), and also had beneficial effects on erectile dysfunction (7). This is certainly promising, but in a world where first time-set In fact, it may even be a useful adjunct with Viagra for this purpose (8). However, in a world where first time steroid users expect upwards of 20lbs per cycle, I would suspect many will be disappointed with the 5lbs or so a cycle of Andriol will produce. Granted, that’s a conservative estimate, but I can’t really be confident predicting much more muscle is to be expected from Andriol. Taking a large amount of Andriol is actually pretty safe (except for your bank account), and there was even a 3 month study done in Korea, where a pretty small dose of Andriol ( 160 mg daily for 3 weeks then half that dose for the remainder of the study) resulted in a very nice rise in testosterone. Serum total testosterone increased from 2.13 +/- 1.20 mg/ml at baseline to 6.04 +/- 3.08 mg/ml (p = 0.005) after 12 weeks. In addition, free testosterone was (barely) significantly changed from 8.60 +/- 2.25 pg/ml to 11.40 +/- 3.81 pg/ml (p = 0.13) (10). However, there were no significant changes in liver function tests, red blood cell count or lipid profiles, nor were there any significant adverse reactions that would have led to the cessation of the administration of oral testosterone. So the scientists at Organon have succeeded in making a nice, safe, moderately effective, orally available treatment for low androgen levels. But can we (athletes and bodybuilders) use it also?

Truthfully, we can’t be confident predicting more than a 5lbs gain with the use of Andriol, because this product has a very odd property, and that is the widely varying effects it has on test subjects. In one study I read, four test subjects were each given Andriol, and one had a huge surge in testosterone levels going up to 60.1nmol/L and the other only had an 11.5nmol/L level (5)! The remaining 2 test subjects fell in between those levels. I am speculating that the differences experienced by the test subjects were primarily due to the variances inherent in the lymphatic system. But to make matters even more inconsistent, there is no evidence that those variances wouldn’t occur within the same person taking Andriol (i.e. you get a huge surge in testosterone one day, and a very minor one the next day). This may be associated with whether this stuff is taken with food or not. Since it operates via association with your small intestine and lymphatic pathways, taking it with food greatly enhances its bioavailability (9). This may be a case of “problem solved,” but I’m hesitant to close the books on Andriol’s absorption problems so quickly. For now, we’ll just say you are spending your money much more wisely if you take your andriol with meals.

Despite all of its problems, if I had the money to run 10-15 caps of Andriol/day and if I were looking for a stand-alone oral compound to safely run for a full cycle, (of perhaps 12 weeks) then it should be admitted, Andriol would be a #1 choice. Testosterone undecanoate may also offer a viable alternative for androgen treatment in women.


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2. A new oral testosterone undecanoate formulation. World J Urol. 2003 Nov;21(5):311-5. Epub 2003 Oct 25. Review.
3. Effects of oral testosterone undecanoate on growth, body composition, strength and energy expenditure of adolescent boys. Clin Endocrinol (Oxf). 1992 Sep;37(3):207-13.
4. Recovery of free androgens in the rat prostate in vivo and in vitro after treatment with orally active testosterone undecanoate (TU). Horm Metab Res. 1980 Oct;12(10):541-5
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6. Effect of oral testosterone undecanoate on visuospatial cognition, mood and quality of life in elderly men with low-normal gonadal status. Maturitas. 2005 Feb 14;50(2):124-33.
7. Effect of 12 month oral testosterone on testosterone deficiency symptoms in symptomatic elderly males with low-normal gonadal status. Age Ageing. 2005 Mar;34(2):125-30. Epub 2004 Dec 13.
8. Oral testosterone undecanoate reverses erectile dysfunction associated with diabetes mellitus in patients failing on sildenafil citrate therapy alone. Aging Male. 2003 Jun;6(2):94-9.
9. Important effect of food on the bioavailability of oral testosterone undecanoate. Pharmacotherapy. 2003 Mar;23(3):319-25.
10. Oral testosterone replacement in Korean patients with PADAM. Aging Male. 2002 Mar;5(1):52-6.
11. I . Administration of testosterone undecanoate in postmenopausal women: effects on androgens, estradiol, and gonadotrophins. Menopause. 2000 Jul-Aug;7(4):251-6.
12. Effects of androgen supplementation therapy on partial androgen deficiency in the aging male: a preliminary study. Aging Male. 2002 Mar;5(1):47-51.
13. Effects of androgen supplementation therapy on partial androgen deficiency in the aging male: a preliminary study. Aging Male. 2002 Mar;5(1):47-51.
14. Therapeutic effect of andriol on serum lipids and apolipoproteins in elderly male coronary heart disease patients. Chin Med Sci J. 1992 Sep;7(3):137-41.