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13103-34-9 Usage


Boldenone undecylenate is a synthetic and injectable anabolic-androgenic steroid, which is a kind of androgen ester used in veterinary medicine, particularly in horses. It has a similar effect as the natural steroid testosterone and is known for its anabolic activity with low androgenic potency. As a yellow oil, it is commonly referred to by its brand name Equipoise in the veterinary context.


Used in Veterinary Medicine:
Boldenone undecylenate is used as an anabolic steroid for enhancing lean body weight in horses, as it increases their appetite and promotes muscle growth and strength. This is particularly beneficial for improving athletic performance and muscle endurance.
Used in Cutting Steroid Applications:
Boldenone undecylenate is used as a cutting steroid to protect against the loss of lean tissue, making it a valuable addition to the regimen of those seeking to maintain muscle mass while reducing body fat.
Used in Horse Performance Enhancement:
Boldenone undecylenate is used as a performance-enhancing drug for horses, improving their temperament, appetite, weight, and muscle tissue strength, which contributes to their overall performance in various equestrian sports and activities.
Used in Goat and Calf Growth Promotion:
Similar to its use in horses, boldenone undecylenate is also utilized in the growth promotion of goats and calves, where it has been observed to have positive effects on their development and muscle growth.


Boldenone undecylenate,Shandong Xinfa Pharmaceutical Co., Ltd.

Manufacturing Process

To a solution 5 g of L-dehydrotestosterone in 25 ml of benzene was added 3 ml of pyridine and 7.1 ml undecylene chloride. The mixture was heated for 2 heurs at 70°C. After cooling pyridine hydrochloride was filtered off. The filtrat was purified via chromatography on neutral aluminum oxide. Benzenic eluate was concentrated to obtain 1-dehydrotestosteron 17-undecylenate (boldenone undecylenate) as an oil; λmax 243-244 nm.

Therapeutic Function



With a chemical ?structure that's nearly identical to testosterone, boldenone can ?stimulate protein synthesis and the release of erythropoietin in the ?kidneys. Athletes sometimes use boldenone, which may be sold on the ?black market, to increase muscle mass and strength.

Mechanism of action

Boldenone is a steroid hormone which has androgenic activity. Androgens bind to the androgen receptor, which regulates gene transcription.

Side effects

May include symptoms of masculinization like acne, increased hair growth, voice changes, and increased sexual desire.

Veterinary Drugs and Treatments

Boldenone is labeled for use as adjunctive therapy “. . . as an aid for treating debilitated horses when an improvement in weight, haircoat, or general physical condition is desired” (Package Insert; Equipoise?—Fort Dodge). Boldenone may possibly be useful to stimulate appetite in cats.


Average dosage of Boldenone Undecylenate is 300-500 mg per week for men and 50-100 mg per week for women. The injection should be administrated at least once every week and the length of a cycle is varies from 7-8 weeks to 10-12 weeks. Side effects are mild and occur in mainly in cases of high dosages. Athletes may experience acne, oily skin, hair loss, diarrhea, hypertension, prolonged blood clotting time, increased libido as well as post-menopausal bleeding, increased sex drive, swelling of the breasts and virilization symptoms in women.


https://www.drugbank.ca/drugs/DB01541 https://en.wikipedia.org/wiki/Boldenone_undecylenate O'Connor, J. J., et al. "Evaluation of boldenone undecylenate as an anabolic agent in horses. " Canadian Veterinary Journal 14.7(1973):154. Fararh, K. M. "Clinicopathological study on the effect of boldenone undecylenate as growth promoting agent in goats. Egyptian journal of comparative pathology and clinical pathology 19 (2), 167-174." (2006). Neamat-Allah, Ahmed N F. "Effect of Boldenone Undecylenate on Haematological and Biochemical Parameters in Veal Calves." Global Veterinaria 13.6(2014):1092-1096.

Check Digit Verification of cas no

The CAS Registry Mumber 13103-34-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,1,0 and 3 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 13103-34:
49 % 10 = 9
So 13103-34-9 is a valid CAS Registry Number.



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name Boldenone Undecylenate

1.2 Other means of identification

Product number -
Other names [(8R,9S,10R,13S,14S,17S)-10,13-dimethyl-3-oxo-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] undec-10-enoate

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:13103-34-9 SDS

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