In this article we’ll talk you all about the new SARM ACP 105, which promises a number of muscle- and strength-boosting benefits.

r/sarmssourcetalk - Update: 7 weeks into Rad 140 and Mk-677. 23 pound gain

A very striking seven-week transformation using SARMs, taken from Reddit

Note: This publication does not condemn or condone the use of SARMS or any other performance enhancing drug. Please note, SARMS are yet to be formally approved for human consumption and the long-term side effects are still not fully ascertained.

What is ACP-105? What does ACP 105 do?

ACP-105 is a new selective androgen receptor modulator (SARM), made by Acadia. The manufacturer claims that ACP-105 has as potent an anabolic effect as testosterone in in-vitro assays. In pre-clinical trials, ACP-105 has demonstrated a powerful affinity for skeletal muscle, making it a true SARM.

As with RAD 150, another new SARM we’ve recently written about, there isn’t a great deal of clinical information on ACP-105 compared with other SARMs like Ostarine. What there is, though, is certainly promising.


Before we go into more detail about ACP-105, first we’ll give you a quick run-through of what SARMs are and how they’re used. If you want to read about SARMs in detail, we recommend consulting our one-stop primer on them, which features as part of our Ultimate Series on SARMs.

ACP-105 is available from our trusted vendor SWISS CHEMS. Use the code “HS11” to get 11% off all SARMS on their website.

What Are SARMs? How Are They Used?

Jon Anthony SARMs results

A sixty-day SARMs transformation

 “SARMS” stands for “selective androgen receptor modulators.” These compounds work similarly to steroids by binding to the body’s androgen (male hormone) receptors and recoding DNA to become more efficient — or “tissue selective — at packing on muscle.

Unlike anabolic steroids, which bind to androgen receptors in many tissues all over the body, individual SARMs selectively bind to androgen receptors in certain tissues, but not in others. 

Although originally developed as “steroidal SARMS” for a viable cure for osteoporosis, cancer, and other diseases in the 1940’s by Ligand Pharmaceuticals, “non-steroidal” SARMS were pioneered in the 90s by GTx Inc giving us the SARMS we use today.

SARMs have presented themselves as an attractive alternative to androgenic anabolic steroids (AAS) in recent years because they boast fewer side effects and because they occupy a legal grey area. SARMs are legal in most territories, with some notable exceptions such as Australia, where a prescription is necessary for them.


It’s worth noting though,  that, because of their anabolic and performance-enhancing properties, most SARMs are a prohibited substance and are listed as an S1 Anabolic Agent on WADA’s prohibited list.

As SARMs are more “tissue-selective” while boasting far fewer androgenic side effects — hair loss, acne, prostate enlargement, clitoral enlargement, unwanted hair growth, etc. —they have begun to become more popular than AAS in many parts of the world.

Bodybuilders and powerlifters alike run SARMs and even stack them with steroids to yield their desired results. This is because SARMs can yield keepable muscle and strength gains without drastic hormonal shifts.

SARMs also tend to be consumed in liquid form, another advantage if you don’t like the idea of having to inject yourself to take an anabolic compound.

SARMs cycles typically last between 2-3 months depending on the compound or stack (mixture of compounds taken), but this may vary according to several factors such as stack, user experience and dosage.

How Strong is ACP 105?

Derek of More Plates More Dates fame has analysed the few studies of ACP-105, including these two (onetwo) and has the following to say about ACP 105.

“The % of anabolic activity was determined to be 67%, with only 21% reversal of the prostate gland (which is used to measure androgenic activity).

From this we can conclude that this SARM has an anabolic:androgenic rating/ratio of 3.19:1

There are several SARMs that have anabolic:androgenic ratios of 3:1 and up though, so this is fairly typical.

While we can vaguely gather what we can expect from this compound (the comparisons that come to mind are Ostarine and S4), without knowing the binding affinity of the compound we can essentially only make shot in the dark guesses.

We do know what kind of interaction ACP-105 has with the androgen receptor though, which helps shed light on things a bit more.

Based on the information that was available, we know that ACP-105 is a partial agonist.


Full agonists induce greater levels of suppression, but are more potent (based on the information presented).

Partial agonists on the other hand, are less suppressive, but are typically weaker relative to Testosterone and DHT, which is the case with ACP-105.

A fairly low concentration of ACP-105 attaches to the androgen receptor better than DHT does, and is blatantly weaker than Testosterone and DHT in general.

In one sense, this is a disappointment as we are all awaiting the release of the end all be all SARM that is only exerts minor suppression, has minimal/zero androgenic side effects, and can rival or beat Testosterone in overall anabolic activity.

This is asking a lot though, and it would be more useful to simply compare ACP-105 to the other most promising mainstream SARMs to determine if it has a place in a researchers up and coming test protocols.”

So it looks like ACP-105 is more or less similar to Ostarine and Andarine in terms of anabolic performance.

The second study, in which mice that had and hadn’t been given ACP-105 were exposed to radiation and the results compared, also suggests that administration of the SARM may have motor-skill benefits such as increased speed, endurance, balance and coordination.

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There’s not a huge amount of info on ACP 105 available, because of how new it is

The studies available on ACP 105 suggest an equivalent human dosage of around 11mg a day. Although there isn’t a great deal of information available, a dosage of 10-15mg a day seems to be agreed upon.

ACP 105 vs Ostarine (MK 2886)

It’s worth noting that like Stenabolic, ACP-105 has a short half-life, which means that you may have to administer it up to three times a day, as the Redditor below notes. This may prove inconvenient for some, and lead them to prefer a SARM with a longer half-life like Ostarine.

Do I Need a PCT if I Take ACP-105?

Because SARMs mimic the role of naturally produced androgens in the human body, they will suppress levels of these hormones; however, the individual response will vary and some compounds, such as Ostarine, are generally considered to be less “suppressive” than others. As a result, some SARMs cycles might require post-cycle therapy (PCT) shortly after consumption or even liver protection such as NAC to combat hepatotoxicity from certain oral compounds. 

It’s clear that ACP-105 is only a partial rather than a full agonist, which means it will have less of a hormone-suppressing effect than a SARM like LGD-4033. We believe it’s probably best for you to assume you will need some kind of PCT. Ideally, you’d have blood work done before, during and at the end of your cycle to gauge accurately the degree to which the SARM has or hasn’t suppressed your natural hormone levels. 

If you want to know more about PCT, read our guide here.

How to Buy ACP-105

If you wish to purchase ACP-105, get 11% off with promo code “HS11” here.