Mass Construction Injectable (LGD-4033 + MK-677 + YK-11)

(10 customer reviews)


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Mass Construction Injectable (LGD-4033 + MK-677 + YK-11) – Product Information

Mass Construction is an Injectable research compound, that combines LGD-4033, MK-677, and YK-11 to explore their potential synergistic effects. This unique blend is formulated for research purposes only and is intended for controlled laboratory investigations. By leveraging the distinct mechanisms of action of each compound, Mass Construction Injectable offers a comprehensive approach to studying muscle growth and overall body composition.

  • Mass Construction consists of 30mg LGD-4033, 50mg MK-677 Ibutamoren, and 20mg YK-11.
  • Mass Construction is offered in 100mg per ml for 10ml, totaling 1000mg.


Ligandrol is a novel nonsteroidal oral selective androgen receptor modulator currently being investigated in research as a potential treatment for conditions relating to muscle dystrophy and osteoporosis.

Mass Construction Injectable – Recent studies investigated the effects of LGD 4033 on muscle tissue in ovariectomized rats. A daily dose of LGD was administered and calculated according to the body weight of each individual rat at the onset of the study. Results and changes were noted as soon as week 2, the control group having weighed significantly less than rats undergoing LGD treatment. This difference remained until the end of the study, irrespective of LGD treatments. Additionally, the LGD treatments resulted in a higher number of capillaries in all muscles studied. Longer randomized trials and research could potentially evaluate its efficacy in improving physical function and health outcomes in select populations.

CAS Number 1165910-22-4
Molar Mass 338.253 g/mol
Chemical Formula C14H12F6N2O
IUPAC Name 4-[(2R)-2-[(1R)-2,2,2-trifluoro-1-hydroxyethyl]pyrrolidin-1-yl]-2-(trifluoromethyl)benzonitrile

MK-677 Ibutamoren

A recent study set out to investigate the effects of MK-677 as a Ghrelin mimetic on body composition and clinical outcomes in healthy older adults. It was found that MK-677 enhanced fluctuating growth hormone secretion and markedly increased fat free-mass over a 12-month period. More extensive research and randomized trials could potentially evaluate its efficacy in improving physical function and health outcomes in select populations.

MK 677 Ibutamoren
CAS Number 159634-47-6
Molar Mass 528.67 g/mol
Chemical Formula C14H12F6N2O
IUPAC Name 2-amino-2-methyl-N-[1-(1-methylsulfonylspiro[2H indole-3,4′-piperidine]-1′-yl)-1-oxo-3-phenylmethoxypropan-2-yl]propenamide



A recent study has shown that YK11, a selective androgen receptor myostatin inhibitor, accelerates the expression of Follistatin in mice. Follistatin is a myostatin and activin-binding protein naturally found in the human body and has been used as a treatment for several degenerative muscle diseases. When follistatin levels are raised, myostatin levels will be inhibited. Inhibition of myostatin results in increased muscle mass and improved strength.

This study revealed that mice with low levels of myostatin have twice the amount of muscle mass compared to mice with high levels of myostatin. This shows the massive potential research implications of the strong anabolic effects that YK-11 can possess.

CAS Number 1370003-76-1
Molar Mass 430.541 g/mol
Chemical Formula C25H34O6
IUPAC Name methyl (2E)-2-[(8R,9S,10R,13S,14S,17S)-2′-methoxy-2′,13-dimethyl-3-oxospiro[1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthrene-17,5′-1,3-dioxolane]-4′-ylidene]acetate
This information is for educational purposes only and does not constitute medical advice. THE PRODUCTS DESCRIBED HEREIN ARE FOR LABORATORY AND RESEARCH USE ONLY. All clinical research must be conducted with oversight from the appropriate Institutional Review Board (IRB). All preclinical research must be conducted with oversight from the appropriate Institutional Animal Care and Use Committee (IACUC) following the guidelines of the Animal Welfare Act (AWA).
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ATTENTION: All our products are for LABORATORY AND RESEARCH PURPOSES ONLY not for veterinary or human usage.


COA LGD 4033 lot 0064 2023 08 21 PR1 1COA MK 677 lot 0071 2023 08 28 PR page 0001COA YK 11 lot 0042 2023 08 21 PR 1 1 1

10 reviews for Mass Construction Injectable (LGD-4033 + MK-677 + YK-11)

  1. Herman Holden

    This stuff works! I have to say I’m impressed. Great job, team Purerawz!

  2. Cruz

    It’s really working.

  3. Rey

    Great value and very effective. After a week, I’ve already seen results. Highly recommended.

  4. Dennis Harris

    Did what it promised. I saw tremendous strength and muscle gain from it. I would recommend that everyone give it a shot and see if it works for them as well as it did for me.

  5. Faisal

    This has been working very well, I am pleased with the results so far.

  6. Fynn Greer

    Great stack! Absolutely insane gains!

  7. Nelson Larson

    Good stuff! Got some great results.
    Thanks PureRawz for these awesome products!

  8. Justin

    Excellent customer service. My order was delivered promptly.

  9. Verified Buyer (verified owner)

    Highly recommend purerawz was a first time buyer from this site and got excellent fast customer service and the product was right on point did its job 👍🏽

  10. KEVIN (verified owner)


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