1,4,6 Androstatriene-dione (ATD)

Diagram of molecule

Chemical Name(s):

Androsta-1,4,6-triene-3,17-dione
1,4,6-androstatriene-3,17-dione
Chemical Formula: C19H22O2
Molecular Weight: 282
CAS: NA
Q Qatio: NA
Anabolic #: NA
Androgenic #: NA
Oral Bioavailability: Estimated at 4%
AR Binding Affinity: NA
SHBG Binding Affinity: NA
Half Life: 2 days
Legal Status (US): Not listed as a controlled substance
Average Dose: 25-100mg/day
Average Cycle Length: 4-8 weeks
Stimulator
Inhibitor

-5
-4
-3
-2
-1

0
1
2
3
4
5

Muscle Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Strength Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Fat Gain (negative indicates fat loss)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Water Retention (extra-cellular bloat)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Aggression

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Libido

[][]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Acne

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Hair Loss

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Prostate Enlargement

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Liver Toxicity

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Lethargy

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Characteristics

ATD is a steroidal aromatase inhibitor, known as a suicidal inhibitor because it permanently binds to the aromatase enzyme.

ATD is used for its aromatase inhibiting and testosterone boosting effect. Its effectiveness at lowering estrogen appears to be stronger than 6-oxo. It converts to 1,4,6-testosterone, which would also be expected to cause falsely high readings for a testosterone analysis.

The 1,4,6-testosterone metabolite of ATD can also bind to the androgen receptor (AR) and induce androgenic (or possibly anti-androgenic) effects similar to what is seen from 6-oxo. This would be expected since 1,4,6-testosterone has about one third the binding affinity for the AR, therefore it may interefere with the anabolic or androgenic action of hormones which bind the androgen receptor.

ATD would also be expected to interfere with production of natural testosterone by acting upon the hypothalamus pituitary testicular axis (HPTA), therefore this compound should not be used during post cycle therapy (PCT), however it could successfully be used during a cycle to help keep estrogen in control. Anecdotal reports and animal studies have also shown ATD inhibits libido and general sexual potency.

Common Clones:

Arom-X by Advanced Muscle Science (AMS)
AIFM by Anafit
ATD MAX by Anabolic Formulations
ATD-JET by Molecular Developments
Reversitol by IForce


Related Discussion

The Official 1,4,6 Androstatriene-dione (ATD) Thread
Posted by Eric

References

Effect of an inhibitor of aromatization, 1,4,6 androstatriene-3,17-dione (ATD) on LH release and steroid binding in hypothalamus of adult female rats.

Exp Brain Res. 1986;64(3):407-10.
Slama A, Gogan F, Sarrieau A, Vial M, Rostene W, Kordon C.

Effects of ATD on male sexual behavior and androgen receptor binding: a reexamination of the aromatization hypothesis.
ME Kaplan and MY McGinnis
Horm Behav, Mar 1989; 23(1): 10-26.

Anabolic Pharmacology
Seth Roberts (2009)

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Androstenetrione (6-OXO)

Diagram of molecule

Chemical Name(s):

4-androsten-3,6,17-trione
3,6,17-androstenetrione
androst-4-ene-3,6,17-trione
6-ketoandrostenedione
Chemical Formula: C19H24O3
Molecular Weight: 300
CAS: NA
Q Qatio: NA
Anabolic #: NA
Androgenic #: NA
Oral Bioavailability: Estimated at 4%
AR Binding Affinity: NA
SHBG Binding Affinity: NA
Half Life: 3-6 hours
Legal Status (US): Not listed as a controlled substance
Average Dose: 300-600mg/day
Average Cycle Length: 4-8 weeks
Stimulator
Inhibitor

-5
-4
-3
-2
-1

0
1
2
3
4
5

Muscle Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Strength Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Fat Gain (negative indicates fat loss)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Water Retention (extra-cellular bloat)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Aggression

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Libido

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Acne

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Hair Loss

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Prostate Enlargement

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Liver Toxicity

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Lethargy

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Characteristics

6-OXO is a steroidal aromatase inhibitor, known as a suicidal inhibitor because it permanently binds to the aromatase enzyme.

It is used for its anti-estrogen and testosterone boosting effects.

There is debate about whether or not 6-oxo actually lowers estrogen or increases testosterone. Several human studies have shown an increase in estrone levels following 6-oxo supplementation. However, one of the primary metabolites of 6-oxo is 6-oxoestrone which may have given a false positive for elevated estrone levels. The human study also concluded that 6-oxo raised testosterone levels, however it is possible that 6-oxotestosterone (which is another metabolite of 6-oxo) gave a false positive for the testosterone level as well.

Another interesting element to these articles is that despite the supposed increase in testosterone (enough to cause significant improvements in body composition if given via injection) no improvements where found for fat free mass (FFM) or strength. Therefore, 6-oxo is either a weak AI that doesn’t really inhibit estrogen at the recommended dose and simply converts to metabolites which give false readings, or it actually does increase testosterone, while the 6-oxo metabolites antagonize the androgen receptor enough to block any anabolic effect from testosterone.

Either way, no ergonomic or real world benefit could be found after 6-oxo supplementation.

Its also worth mentioning that 6-oxo should never be used post cycle, as its steroidial effects would likely interfere with recovery of natural testosterone production.


Related Discussion

The Official Androstenetrione (6-OXO) Thread
Posted by Eric

References

Immunological interference of the synthetic aromatase inhibitor 1,4,6-androstatriene-3,17-dione (ATD) and its metabolite(s) in the radioimmunoassay for testosterone.

MD Donaldson and MG Forest
Steroids, Dec 1980; 36(6): 717-21

Testosterone dose-response relationships in healthy young men
Shalender Bhasin, et al.
Am J Physiol Endocrinol Metab, Dec 2001; 281: E1172 – E1181.

Formestane

Diagram of molecule

Chemical Name(s):

4-Hydroxyandrost-4-ene-3, 17-dione
4-hydroxy-4-androstene-3,17-dione
4-Hydroxyandrostenedione
Chemical Formula: C19H26O3
Molecular Weight: 302
CAS: NA
Q Qatio: NA
Anabolic #: NA
Androgenic #: NA
Oral Bioavailability: Estimated at 4%
AR Binding Affinity: NA
SHBG Binding Affinity: NA
Half Life: 2-3 hours oral, Transdermal: Varies by matrix
Legal Status (US): Not listed as a controlled substance
Average Dose:
Aromatase inhibition
100-200mg/day (transdermal)
150-250mg/day (oral)

Anabolic effects
800-1000mg/day (oral)

Average Cycle Length: 4-8 weeks

Stimulator
Inhibitor

-5
-4
-3
-2
-1

0
1
2
3
4
5

Muscle Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Strength Gain

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Fat Gain (negative indicates fat loss)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Water Retention (extra-cellular bloat)

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Aggression

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Libido

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Acne

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Hair Loss

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Prostate Enlargement

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Liver Toxicity

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Lethargy

[]
-5
-4
-3
-2
-1

0
1
2
3
4
5

Characteristics

Formestane is a steroidal aromatase inhibitor, known as a suicidal inhibitor because it permanently binds to the aromatase enzyme.

Formestane was originally used as an injectable for breast cancer patients, but due to its possible androgenic effects it has largely been replaced by non-steroidial AIs in the medical community. Most of its use is now is limited to the bodybuilding community since it is available as a legal dietary supplement for reducing estrogen and increasing testosterone production.

Although formestane can effectively reduce estrogen through oral consumption, its low oral bioavailability has lead to the development of several transdermal based products (which appear to offer higher efficacy at a lower dose).

Relative to 6-oxo and ATD, Formestane is a more potent aromatase inhibitor, which appears to effectively reduce natural estrogen levels by as much as 50% within several days (while higher doses may further suppress estrogen). Because of formestanes potent ability at reducing estrogen it will tend to reduce HDL levels, while increasing LDL levels, thus harming the cholesterol profile. For this reason, it is recommended to limit cycles of formestane to 8 weeks max.

Because formestane also has a strong affinity for the 5a-reductase enzyme it will reduce DHT levels in the body by effectively competing with testosterone for the 5a-reductase.

Formestane converts to the active androgen 4-hydroxytestosterone which has about half the anabolic potency, and about 25% of the androgenic potency as testosterone. This would suggest that fairly high doses of formestane (800-1000mg/day) could lead to some level of anabolic enhancement (although the amount required for this would surely lead to undesirably low estrogen levels).

Formestane is successfully used as a standalone during re-composition cycles to help reduce “bloat” and fat storage. It can also be used as an anti-estrogen to counter aromatization of aromatizing steroids.

Common Clones:

Formestane by Primordial Performance
Formex by Innovative Body Enhancement (IBE)
Formestane by Competitive Edge Labs (CEL)
Formadex by BCS LABS

Related Discussion

The Official Formestane Thread
Posted by Eric

References

Anabolic Pharmacology
Seth Roberts (2009)

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