Ibutamoren (MK-677) SARMS powder

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Ibutamoren (MK-677)

Ibutamoren (MK-677)

Ibutamoren (MK-677)

CAS 159634-47-6
Formula: C27H36N4O5S
Molar mass: 528.662 g/mol

Ibutamoren (INN) (developmental code names MK-677, MK-0677, L-163,191) is a non-peptidic, potent, long-acting, orally-active, and selective agonist of the ghrelin receptor and a growth hormone secretagogue, mimicking the growth hormone (GH)-stimulating action of the endogenous hormone ghrelin.
Ibutamoren mesylate, or MK-677, promotes growth hormone and insulin-like growth factor 1 (IGF-1) and IGFBP-3 secretion (R).

MK-677 also regulates body composition, bodily fluids, muscle and bone growth, and sugar and fat metabolism.

It mimics the growth hormone and stimulates the action of the hormone ghrelin

MK-677 is known to increase growth hormone levels and metabolism.

It controls the destructive effects of insulin on body composition. This helps it increase leanness and decrease fat storage

Here’s a look at the chemical composition of MK 677 (Nutrobal).

Butamoren aka MK-677 has been sold over the counter as a bodybuilding product, or as a research chemical for quite some time now.  SARMs are the new big thing so Mk-677 has been marketed as such, however it is in fact NOT a SARM.  SARMS are selective androgen receptor modulators, which by act they exact same way steroids do; only SARMs are selective and target only specific androgen receptors.  The good thing about SARMs is it’s like taking a mild steroid without getting side effects (immediately anyhow).  The potential side effects of SARMs are relatively unknown, although they could be quite harmless and eventually replace steroids all together.  That being said, MK-677 (Ibutamoren) does not target any androgen receptor in the human body, and is therefore not a SARM.  Simply put, it’s better than a SARM


Promotes the healing of ligaments, tendons, bones as well as old injuries
Stimulates loose skin to tighten
Promotes lean muscle mass
Increases the oxidation of fat.
Here is an example of a Nutrobal + Cardarine + Andarine Cycle

Week NutrobalMk-677 CardarineGW-501516 Anrdarine(S-4) HCGenerate ES N2Guard
1 25mgs/ED 20mgs/ED 25mgs/ED 5tabs/ED 5caps/ED
2 25mgs/ED 20mgs/ED 35mgs/ED 5tabs/ED 5caps/ED
3 25mgs/ED 20mgs/ED 35mgs/ED 5tabs/ED 5caps/ED
4 25mgs/ED 20mgs/ED 45mgs/ED 5tabs/ED 5caps/ED
5 25mgs/ED 20mgs/ED 45mgs/ED 5tabs/ED 5caps/ED
6 25mgs/ED 20mgs/ED 50mgs/ED 3tabs/ED 5caps/ED
7 25mgs/ED 20mgs/ED 50mgs/ED 3tabs/ED 5caps/ED
8 25mgs/ED 20mgs/ED 60mgs/ED 2tabs/ED 5caps/ED
9 25mgs/ED 20mgs/ED 60mgs/ED 2tabs/ED 5caps/ED
10 25mgs/ED 20mgs/ED 70mgs/ED 2tabs/ED 5caps/ED
ED = every day

mgs = milligrams

tabs = tablets

caps = capsules

Results have been shown from doses between 5-25mgs a day, dose dependent results should be expected. Higher doses, over 50mgs, have been reported by some, but I don’t see the need to overdo it.

Testing For MK-677

Athletes in competitive sports may be concerned about MK-677 showing up in doping screens.

It’s difficult to test for human growth hormone, and very difficult to test for MK-677. You’d need to specifically be looking for it. MK-677 isn’t like taking exogenous growth hormone. With MK-677, you’re stimulating your own body to produce more growth hormone.

Ibutamoren (MK-677) Cheatsheet

  • Mimics the action of ghrelin
  • Promotes nocturnal pulses of growth hormone
  • Increases insulin-like growth factor (IGF-1) and insulin-like growth factor-binding protein 3 (IGFBP-3)5
  • Administered orally (25 mg is typical)

Studies in Humans

First, it’s not an obscure research compound that’s only been tested in lab rats. Studies in older adults suggest MK-677 robustly boosts growth hormone secretion and IGF-1 in actual humans.

Orally Bioavailable

Second, MK-677 has advantages over other ghrelin mimetics. It’s not a peptide – so it’s not degraded in the gastrointestinal tract – and is therefore orally active. You can just ingest 25 mg MK-677. That’s a hell of a lot more convenient than injecting peptides!

Promising Health Benefits

The health benefits of MK-677 look promising. Growth hormone declines with aging, and MK-677 has proved in randomized, placebo-controlled trials to reverse this decline.

This is a classic approach to longevity research. Figure out what hormones, neurotransmitters or other signals decline with aging. Next, see if restoring levels also reverses the effects of aging.