MK2866 Ostarine PCT

Ostarine PCT is a popular topic in bodybuilding circles. That’s because Ostarine (MK2866) is a mild beginner SARM. This is the reason why a lot of people interpret it as a sign that you do not need a PCT plan for it.

While there are some situations when a specific person may not need an actual Ostarine PCT plan, in most cases, people do actually need Post Cycle Therapy after running it. Whether you need a PCT after running a cycle with MK-2866 it depends on how you’re getting suppressed. Some people barely get any suppression, whereas others are getting heavily suppressed in really low amounts, simply because their body works in this way.

The suppression rate, therefore, depends mainly on 3 factors:

  1. The dosage you use
  2. The cycle length
  3. How your body responds to it

Moreover, do not forget that in case you choose to stack it with other suppressive compounds, then the suppression rate increases too, based on the three factors I’ve shared.

Generally, contrary to popular belief, Ostarine (MK-2866) is actually suppressive to natural testosterone production levels. Still, because it is only mildly suppressive, you may not need a PCT plan after stopping it in case you use low doses, for short periods of time, without stacking it with other suppressive compounds. Usually, a month or so is going to be enough to recover naturally.

Yet, in case you get suppressed quite a lot even at low doses and short cycles (because of how your body responds to it/ genetics), then you still need an Ostarine PCT plan. You are also likely to need an Ostarine PCT plan if you:

  • Use large doses of it
  • Use it for longer periods
  • Stack with other suppressive compounds

Let’s explain PCT

When you’re administering an exogenous source of testosterone in the body, your body reacts to it by stopping the production of testosterone. That’s a defense mechanism of the body against “too much testosterone”. Your body senses the presence of plenty of testosterone, so it strives to maintain a proper balance of hormones, that’s why it stops the production of testosterone.

This is the reason why you may end up with low testosterone levels after you stop the cycle of SARMs. The body restarts the natural testosterone production, but this is a slow process. So, your body doesn’t produce enough testosterone, and you stop using SARMs. That’s the period when your body lacks this hormone, and that’s when you need PCT.

If you do not have a PCT due to low testosterone levels, then you’re likely to suffer from lots of negative symptoms. Low testosterone levels lead to low libido, low energy levels, loss of hard-earned muscle, fat gains, loss of motivation, and other issues. You may also even get gynecomastia because of the testosterone to estrogen imbalances.

That’s why PCT for SARMs is there. It basically helps alleviate these symptoms by helping your body boost natural testosterone production after the cycle ends. PCT helps your body reach a normal hormonal balance faster, mainly by boosting natural testosterone production. I strongly recommend clicking the link for more information regarding Post Cycle Therapy. Ostarine PCT is no different. The only difference is that, as said, this is a milder SARM. Which means that it may require a milder PCT plan. That’s because the suppression rate from using it is likely to be milder than from using another more powerful SARM which is able to produce heavier testosterone suppression.

PCT Side Effects

A Post Cycle Therapy (PCT) plan involves using some medicines. We’re talking about Nolvadex (Tamoxifen) and/or Clomid (Clomiphene). You can also use natural PCT products including supplements, natural compounds, vitamins, minerals, and others. But a real PCT plan involves Nolvadex and/or Clomid. These are SERMs (Selective Estrogen Receptor Modulators) and may come with side effects of their own.

While most people report they are doing well on these compounds without any side effects at all (after all, they are used to combat side effects, not to create new ones), some are still possible. Some of the common side effects associated with SERMs are:

  • Headaches
  • Mood swings
  • Vision problems
  • Depression
  • Brain frog
  • Erectile dysfunction
  • Fatigue
  • Hot flashes
  • Dizziness

You may not experience any of them. Or you could experience just one. At the same time, there are people who experience multiple of them. Others report very mild symptoms, others, however, say that they are bad enough to interfere with their day to day life.

This is the reason why I recommend PCT only when necessary and in the lowest effective doses. Considering that PCT is something you are very likely to need after using suppressive compounds, even such as MK2866 attempt using the lowest effective dosage. With low doses of SERMs (medications for PCT), you are unlikely to get any nasty side effects.

What is Ostarine, Summary

Ostarine is perhaps the most popular SARM on the market. This is the name of the compound MK-2866 AKA Enobosarm. It is a Selective Androgen Receptor Modulator (SARM), because of the way it works in your body. It binds to particular androgen receptors in the body, mostly in the muscles and bones, without affecting other androgen receptors. For this reason, Ostarine (MK2866) has been proven effective for athletes, bodybuilders, and in professional sports. For this reason, it was forbidden to use in professional sports, as it provides unfair advantages similar to anabolic steroids. The main Ostarine benefits are:ostarine-mk-2866

  • Increases muscle mass
  • Improves bone strength
  • Enhances energy, stamina, endurance, and motivation
  • Boosts fat loss

People suggest that a single 8-week cycle with MK-2866 can help lose 3-5% of body fat, gain 10-20% of strength, and add about 5-10 pounds of lean muscles. But it is quite obvious that exercise routine and diet plan should be on point for such results.


Still, Ostarine (MK2866) comes with possible side effects. Some of them include:

  • Hair shedding
  • Headaches
  • Liver toxicity
  • Suppression of natural testosterone

Based on everything, we slowly approached the main topic: Ostarine PCT.

Do I Need Ostarine PCT?

I cannot answer this question without first looking at your blood test post-cycle. Moreover, you need to take into consideration your cycle length, the dosage you used, gender, other compounds you used, and previous experience with SARMs.

Generally speaking, you are not going to need an Ostarine PCT plan unless you feel testosterone suppression. But in order to stop questioning whether you need a PCT plan or not, you need to have a blood test. If you find out you have low T levels, then yes, you need a PCT plan.

You may need a PCT even if you’re just feeling low testosterone symptoms. Especially if you’ve had large doses for prolonged periods.

In case you do have the blood work test, check the testosterone levels, SHBG, FSH, and LH. If any of these hormones are not within normal range, then you should seriously consider having an Ostarien PCT plan. In fact, you may consider it even if you feel fine. That’s because you never know when moods can change and low motivation, loss of sex drive, or depression may hit.

Ostarine Cycles Without PCT

The highest dosage I’ve heard of a person using Ostarine (MK-2866), without requiring a PCT plan is 20 mg/day for 8 weeks. But remember that it is individual, this doesn’t mean that if you use 20 mg/day of Ostarine for 8 weeks you won’t need a PCT plan either. That’s because, at the same time, I’ve heard of men requiring a PCT plan after using Ostarine for 10 mg/day for only 6 weeks (although this is not very common).

In the end, if you use anything under 10 mg/day, you may not need it. If you use anywhere between 10-20 mg/day then it depends. If you use anything over 20 mg/day, then you’re very likely to need PCT. Cycles of 6-8 weeks may or may not need a PCT, depending on your reaction. Longer cycles are likely to need a PCT because your body doesn’t produce testosterone naturally for too long.

How to Ostarine PCT?

It is very unlikely you will require both medicines for PCT (Nolvadex and Clomid) because Ostarine (MK2866), after all, is not heavily suppressive. You may need both only with heavy suppression. Which one exactly you need (Tamoxifen or Clomiphene) depends on how your body responds to each compound. But, it seems that most people respond better to Nolvadex. You could give it a try and in case you notice something wrong, you could switch to Clomid (or vice versa).


The Ostarine PCT is usually mild. It involves 4 weeks PCT plan as:

  • Nolvadex 20 mg per day
  • Or Clomid 25 mg per day

In case the suppression is pretty bad (like your blood test looks bad), then do not be shy to go for an even heavier PCT plan for better results such as 4 weeks PCT plan as:

  • Nolvadex 40 mg/day for the first 2 weeks, then 20 mg/day.
  • Or Clomid 50 mg/day for the first 2 weeks, then 25 mg/day.

As said, only in harsher suppression you may need to use both. But unlikely with Ostarine PCT because, then again, MK-2866 is a pretty mild compound.


It is pretty hard to determine whether you need Ostarine PCT and how exactly to run this Ostarine PCT in case you do actually need it. That’s because we’re all different, with unique bodies and responses to this compound. This is why we all experience suppression in different ways. The best thing you can do is to have a blood test before and after your cycle with MK-2866. That’s the most accurate way to tell if you need Post Cycle Therapy. But people with experience also can determine it by the way they feel.

In the end, if you do not extend your cycle beyond 8 weeks and keep doses low, you may avoid the need for a PCT. But then again, it depends. I just recommend going for whatever works best for you.

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