an adrenal androgen precursor that is transformed to testosterone by 3 beta hydroxysteroid dehydrogenase within the prostate cell; testosterone can also be oxidized to androstenedione by 17 beta hydroxysteroid dehydrogenase

A weak androgenic steroid secreted by the adrenal cortex, testes, and ovary. In normal males less than 5% of their testosterone comes from the conversion of adrenal androstenedione. Androstenedione is converted to testosterone by the enzyme 17-ketoreductase. Androstenedione and testosterone are converted to estrone and estradiol in peripheral tissues (primarily in adipose tissue but also in muscle, kidney, liver and the hypothalamus) by aromatase. The conversion of androstenedione and testosterone accounts for more than 75% of the estrogens in the plasma of normal men. The rest is synthesized in the testes. Gonadotropin secretion may be partially controlled by estrogen formation in the hypothalamus.!-- google_ad_client = "pub-3464612458968655"; google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_ad_type = "text"; google_ad_channel =""; google_color_border = "ffffff"; google_color_bg = "ffffff"; google_color_link = "389CE9"; google_color_url = "CC0000"; google_color_text = "000000";

Androstenedione is testosterone booster. Androstenedione is next step up from DHEA and is the direct precursor to testosterone. It´s naturally made in men and women. Best dosage for androstenedione could be 50 - 100 mg, one hour before training or to enhance the anabolic drive 50 -100 mg first thing in the morning and another 50 -100 mg in the evening. Absorption may be better on an empty stomach! Some bodybuilders stack it with DHEA and Tribulus terrestris. It may cause some side effects like acne, gyno and decrease in good cholesterol. It´s not recommended for women as it may cause acne, lowering of the voice and facial hair growth.

Androstenedione is a hormone that occurs naturally in the body, and is one of those responsible for male characteristics. It is a metabolite of DHEA, and as such, a direct precursor to the male hormone testosterone. Supplementation with androstenedione increases blood levels of testosterone, which among other things, will lead to an increase in strength and muscle mass. As such, it is mainly of interest to athletes and bodybuilders, for whom it has the added benefits of increasing energy levels, improving levels of nitrogen retention and shortening muscle recovery time.

One of the male hormones that is produced in small quantities in a woman's body; the other is testosterone.

A male sex hormone.

a precursor to testosterone, between DHEA and testosterone. Increases serum testosterone, peaking at 1 1/2 hours, and returning to normal after 3 hours. Best use: one 100mg dose per day, before workout. NOT RECOMMENDED FOR WOMEN

This naturally-occurring prohormone is a precursor to testosterone and helps elevate the levels of this important male hormone. BACK

Oral applications of Androstenedione may increase blood levels of testosterone. This effect may cause increased energy, enhanced growth and recovery from external stressors (such as weight training). The increase in testosterone levels may be as great as between 40 - 87% and may stay elevated for up to 3 hours. Our body converts 4-AD to testosterone via a liver enzyme. Testosterone is responsible for muscular growth, decreased body fat, strength, and recovery. Testosterone is also responsible for body hair growth, deepening of the voice and increased aggression. Some of these side effects can be beneficial to men but women need to pay close attention to the male characteristic side effects.

A steroid sex hormone that is secreted by the testes, ovary, and adrenal cortex and acts more strongly in the production of male characteristics than testosterone.

Androstenedione is a natural steroid hormone found in all animals (meat) as well as some plants (extracts). It is a metabolite of DHEA that serves as a direct precursor (one step removed) in the bio-synthesis of testosterone. In all mammals, androstenedione is produced in the gonads and adrenal glands. This oral form of androstenedione is metabolized in the liver to testosterone in conjunction with a zinc-dependant enzyme.

An androgen (male hormone). Androgens are produced in two sites in the male body - most originate in the testes, but some potent male hormones are produced by the adrenal glands, located just above the kidneys. Androstenedione is a pivotal adrenal steroid that's actually one step closer to being converted to testosterone than DHEA. See: AndroPro

One of the androgens (male hormones) that are naturally present in women. (Other androgens include testosterone and DHEAS.) These hormones play an important role in ovulation. High levels of androgens in women may indicate an abnormality in the ovulation process.

a weaker androgen

A sex steroid hormone with masculinising activity.

Androstenedione (also known as 4-androstenedione) is a 19-carbon steroid hormone produced in the adrenal glands and the gonads as an intermediate step in the biochemical pathway that produces the androgen testosterone and the estrogens estrone and estradiol. It is the common precursor of male and female sex hormones. Some androstenedione is also secreted into the plasma, and may be converted in peripheral tissues to testosterone and estrogens.