Kraken Stack (LGD-4033 + YK-11 + S23)

(3 customer reviews)


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Kraken Stack (LGD 4033 + YK-11 + S23) – Product Information

The Kraken Stack, consisting of LGD 4033, YK-11, and S23, is a combination of selective androgen receptor modulators (SARMs) often researched for their potential effects on muscle growth and performance.

  • Kraken Stack consist of LGD-4033, YK-11 and S23.
  • Tablets are offered in 2 variants: 25mg LGD 4033, 25mg YK-11, and 25mg S23, totaling 75mg per tablet for 20 tablets or 1500mg in total; and 40 tablets or 3000mg in total.
  • The liquid is offered as 33.3mg LGD-4033, 33.3mg YK-11, and 33.3mg S-23 per ml, totaling 100mg per ml for 30ml, and 3000mg in total.

LGD-4033 (Ligandrol)

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.

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


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


According to the available studies, S23 induced infertility in all rats that it was exposed to. These effects are dose-dependent and temporary, meaning the rats regained fertility following the treatment. This shows the potential of S23 as an oral male contraceptive.

According to the research, S23 subdues serum concentration of luteinizing hormone and follicle-stimulating hormone to produce biphasic effects on spermatogenesis. Additional research and clinical trials should be conducted to determine the efficacy and safety of S23 as an oral contraceptive.

The above-mentioned study produced other beneficial desirable effects. For instance, researchers observed a stronger affinity to androgen receptors as compared to other popular compounds like Andarine. It also has an ideal anabolic-androgenic ratio allowing it to produce a good number of positive effects without any severe complications. One of those effects was increasing bone mineral density and lean muscle mass.

Therefore, while S23 may be effective as a male birth control pill, it can also be used for other purposes, especially among patients with chronic conditions that lead to muscle wasting.

CAS Number 1010396-29-8
Molar Mass 416.76 g/mol
Chemical Formula C18H13ClF4N2O3
IUPAC Name (2S)-3-(4-chloro-3-fluorophenoxy)-N-[4-cyano-3-(trifluoromethyl)phenyl]-2-hydroxy-2-methylpropanamide
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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COA LGD 4033 lot 0064 2023 08 21 PR1 1COA YK 11 lot 0042 2023 08 21 PR 1 1 1COA S 23 lot 0066 2023 08 18 PR1 1

3 reviews for Kraken Stack (LGD-4033 + YK-11 + S23)

  1. Robert Boyd

    This STACK delivers some significant gains! I’ve experienced notable improvements in muscle mass and strength during my cycle. The stack is potent, so I’d recommend it to experienced users looking to take their fitness journey to the next level!

  2. KEVIN (verified owner)


  3. newtonedwards

    I’ve experienced noticeable improvements in my workouts and recovery.

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