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Formestane (566-48-3)

Rating: SKU: 566-48-3. Category:

AASraw is with synthesis and production ability from gram to mass order of Formestane (CAS 566-48-3), under CGMP regulation and trackable quality control system.

Formestane oiwder was the first selective, type I, steroidal aromatase inhibitor used in the treatment of estrogen-receptor positive breast cancer in post-menopausal women. Formestane suppresses estrogen production from anabolic steroids or prohormones. It also acts as a prohormone to 4-hydroxytestosterone,…

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Product Description


Formestane video




Formestane basic Characters


Name: Formestane
CAS: 566-48-3
Molecular Formula: C21H30O3
Molecular Weight: 302.41
Melt Point: 199-202°C
Storage Temp: RT
Color: White crystalline powder



Formestane (566-48-3) usage in steroids cycle



Formestane (566-48-3), also called lentaron, chemical name: 4-hydroxyandrostenedione.


Formestane (566-48-3) Usage

The most common version of formestane sold was in a topical gel form and it was dosed at 100-200mgs per application. Users would apply it onto clean, dry skin and rub in thoroughly; usually on the thighs or upper arms. It took 1 to 5 minutes to dry. The injectable version for both breast cancer purposes and bodybuilders is 125mgs twice per week or 250mgs once per week.


Warning on Formestane

Formestane (CAS 566-48-3) does not cause many side effects unless abused. Sometimes bodybuilders will complain of dry joints, mood swings, libido changes, or rashes, which are typical of all AI’s. Another side effect is lower HDL (good) cholesterol, so you have to watch your diet.

4.Further instructions:
Formestane is a second generation, irreversible, steroidal aromatase inhibitor. It inhibits the aromatase enzyme responsible for converting androgens to estrogens, thereby preventing estrogen production.

Breast cancer may be estrogen sensitive or insensitive. A majority of breast cancers are estrogen sensitive. Estrogen sensitive breast cancer cells depend on estrogen for viability. Thus removal of estrogen from the body can be an effective treatment for hormone sensitive breast cancers.

Formestane has been targeted specifically for the treatment of postmenopausal women. Unlike premenopausal women who produce most estrogen in the ovaries, postmenopausal women produce most estrogen in peripheral tissues with the help of the aromatase enzyme. Formestane (566-48-3), an aromatase inhibitor, can thus help to decrease the local production of estrogen by blocking the aromatase enzyme in peripheral tissues (ie. adispose tissue of the breast) to treat hormone sensitive breast cancer.



How to buy Formestane from AASraw


1.To contact us by our email inquiry system,or online skypecustomer service representative(CSR).
2.To provide us your inquired quantity and address.
3.Our CSR will provide you the quotation, payment term, tracking number, delivery ways and estimated arrival date(ETA).
4.Payment done and the goods will be sent out in 12 hours(For order within 10kg).
5.Goods received and give comments.