SKU: 46479641874

OTR-AC (MK-29, OSTARINE-O-ACETATE) Solution, 750mg (25mg/mL)

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Description

OTR-AC (MK-29, OSTARINE-O-ACETATE) Solution, 750mg (25mg/mL)OTR AC (MK 29, OSTARINE O ACETATE) OTR AC, also known as MK 2866 Ester, is MK 2866 (Ostarine) that has undergone esterification (the process of combining an organic acid with an alcohol). This chemical process is used to maximize potency and extend the half life (the time required for a quantity to reduce to half of its initial value) of a substance. Due to this process, the ester version of ostarine has the capacity to remain bioactive ten times

OTR-AC (MK-29, OSTARINE-O-ACETATE)

OTR-AC, also known as MK-2866 Ester, is MK-2866 (Ostarine) that has undergone esterification (the process of combining an organic acid with an alcohol). This chemical process is used to maximize potency and extend the half-life (the time required for a quantity to reduce to half of its initial value) of a substance. Due to this process, the ester version of ostarine has the capacity to remain bioactive ten times longer. This results in benefits such as reduced dosing frequency and more stable blood levels.

How OTR-AC Works 
As the ester version of the selective androgen receptor modulator (SARM) ostarine, OTR-AC is more potent and has longer-lasting effects. By binding to proteins in the body known as androgen receptors, it stimulates the formation of muscle tissue. This, in turn, leads to an increase in muscle mass and strength.

Research on OTR-AC
Increase in Muscle Mass and Strength 
Studies suggest that OTR-AC, along with other SARMs, increases muscle mass and strength by stimulating the formation of muscle tissue:

  • In adult rats, the administration of SARMs, including OTR-AC, resulted in an increase in lean muscle mass and a decrease in body fat percentage.
  • In older male and female rats, OTR-AC administration resulted in increased lean muscle mass, decreased fat mass, and significant improvements in their ability to climb stairs.
  • Studies showed that OTR-AC may help increase muscle mass in rats with cancer cachexia (muscle wasting).
  • In older male and female rats, OTR-AC significantly improved total lean body mass and physical function.
  • In rats that had their ovaries surgically removed, OTR-AC improved muscle tissue.
  • In rats, OTR-AC increased muscle mass by enhancing the production of muscle cells.

Reduction of Body Fat 
Aside from helping gain muscle mass, OTR-AC has also been found to reduce overall body fat:

  • In Phase I and II clinical trials, OTR-AC has demonstrated promising results in increasing total lean body mass, decreasing total tissue fat percentage, and enhancing functional performance.
  • A review of studies showed that OTR-AC can help increase lean body mass and reduce body fat in overweight rats.
  • In a phase 2a study, the administration of OTR-AC along with other SARMs resulted in increased lean fat mass and decreased body fat percentage.
  • In male rats, OTR-AC increased fat cell breakdown by improving lipid metabolism and affecting the release of adiponectin (a hormone that regulates fatty acid breakdown).

Improvement of Bone Health 
Studies suggest that OTR-AC can help stimulate bone formation and protect against bone disorders:

  • In rats that had their ovaries surgically removed, OTR-AC administration resulted in improved bone healing.
  • In a rat model for aged male osteoporosis, both OTR-AC and testosterone treatments improved bone healing by increasing callus volume and area, bone volume and density, and bone width.
  • In a rat model of postmenopausal osteoporosis, high doses of OTR-AC for 5 weeks resulted in increased bone volume, density, and bone mineral density.

 

Reduction of Cholesterol Levels 
Evidence suggests that OTR-AC can help lower cholesterol levels, especially low-density lipoprotein (bad cholesterol):

  • In older male and female rats, OTR-AC administration resulted in a significant reduction in low-density lipoprotein levels.
  • In rats that had their ovaries surgically removed, OTR-AC treatment reduced blood cholesterol levels.

 

Concentration
25mg/ml.

Half Life
24 hours.

DISCLAIMER
This material is sold for use in laboratory research only. Terms of sale apply. Not for human consumption, nor for medical, veterinary use. Please use with our DISCLAIMER before ordering.

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SKU: 46479641874

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Greta
Draper, US
★★★★★ 4
One of the better American sunscreens
Size: 1.7 Fl Oz (Pack of 1)
One of the better sunscreens you can get in the U.S. for an affordable price. Neutrogena’s facial sunscreens can be a hit or miss, but this is their better ones. I’m used to using Asian sunscreens that feel like a light moisturizer or serum on the face so I’ve been spoiled. It’s nice to find an American sunscreen that is spf 50+ with no white cast that also feels lightweight, non-greasy, and doesn’t sting my eyes. This sunscreen fits the bill. I used four pumps of product to cover my face to get proper coverage. I could have used a little more tbh. The serum is a very light beige and a bit watery in texture. It blends out invisible as advertised. The finish is shiny and a little greasy looking at first, I’ll admit, but it dries down to a natural finish. I did use a Korean toner pad before applying the sun serum. The end result with the Neutrogena sun serum is a natural finish with a subtle healthy glow in 70 degree weather. It does sting my eyes when I sweat or exercise though. One star off for that. Also it does not pill under makeup.
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Reviewed in the United States on April 18, 2025
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honest and to the point
Birmingham, US
★★★★★ 5
Great SPF for daily use
Size: 1.7 Fl Oz (Pack of 1)
Wonderful for daily use and for under makeup! I love the feel of this SPF. Leaves a nice hydrated feel and makeup goes on top of it perfectly. I have been more compliant with wearing sunscreen everyday since I purchased this. Give it a try!
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Reviewed in the United States on May 26, 2026
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Mary
Battle Creek, US
★★★★★ 5
This SPF 60 makes for an effective moisturizer.
Size: 1.7 Fl Oz (Pack of 1)
Love this stuff. Definitely moisturizes as it's protecting. Only thing, am unable to put around my eyes, as it stings, so will have to find something else to protect the sensitive eye area from the sun. Love the compact size as well and you only need a one small pump for your face. It goes a long way.
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Reviewed in the United States on April 1, 2026
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Sonia
Carnegie, US
★★★★★ 3
Eyes burn but good for face
Size: 1.7 Fl Oz (Pack of 1)
This sunscreen is really light weight and gives me a glow without being to greasy and heavy. I love this sunscreen but it makes my eyes burn throughout the day
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Reviewed in the United States on May 14, 2026
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Sharon
Draper, US
★★★★★ 5
Lightweight and it works!
Size: 1.7 Fl Oz (Pack of 1)
I love how this sunblock goes on so smoothly. I use it daily and have not gotten burned in this extreme Florida weather. I also like that I don’t sweat using it, unlike some other sunscreens I’ve use.
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Reviewed in the United States on June 7, 2026

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