After a couple of recent posts from eroiders using deca, i decided to make a post about the topic entitled in this post, while also providing some pointers that in my experiences have helped with deca-dick or n-pee-pee.

Here is my roster:

1) Stats are fundamental
2) Cycle History?
3) AI Availability
4) Cabergoline and Letrozole: A brief inro
4) Deca:Test ratio
5) A brief insight into test and tren
6) A brief insight into test and deca
7) PCT Protocol (G+C+Z's)
7) Deca facts
8) Deca opinions
9) Harrrrrd PCT
10) High dose vs. Low Dose Deca

First and foremost are stats, to depict whether this person is actually fit for a 19-nor-progesterone compound. Additionally, a cycle history is equally as important, since you don't really want a 19 year old, 110lbs guy to run deca at 800mg for 6 weeks with anavar and 24% BF.

Stats
Age: ?
Height: ?
Weight: ?
BF: ?
Cycle History

Additionally, while using 19-nor-progesterone compounds, AI's use during the cycle is mandatory. AI's such as Aromasin or Arimidex should be used alongside Letrozole or Cabergoline.

Caber and letro would be used in addition to an AI (such as asin adex - caber and letro are also AI's but are much stronger variants). An AI controls the oestrogen production and caber is an anti-prolactin used for 19 norprogesterone compounds such as npp, tren or in this case deca

Deca is generally ran at a 2:1 ratio of test:deca respectively

The difference between test and tren (in short) is that they will fight for the same receptors. However, tren is significantly stronger and more successful at gaining those receptors when compared to test. As a result of the aforementioned fact, the result of running test and tren at equal to high dosages are basically redundant, since the result will be an increase in wastage of the test.

Moreover, tren is highly suppressive of male testosterone production if present in the system - even at low levels. Since normal male estrogen levels are provided through aromatisation of testosterone, natural test production is highly suppressed in a trenbolone cycle, whereas estrogen levels generally fall below normal. As a result, this typically is very problematic with mood swings, changes in libido and joint issues.

In contrast, the aforementioned test/tren rule does not follow suit when test/deca/npp is concerned - regardless of both being 19-norprogesterone compounds. Thus, the protocol recommended with deca is high test and low deca. Additonally, another reason to drop the deca completely (and why some eroids members tend to avoid deca) is the high aromatisation levels associated with deca. However, there is a benefit to deca when one is running an AI during the cycle, such as Aromasin or Arimidex, as this helps to block that process.

Additionally, Deca is preferred in some cases, even though it is very suppressive - thus at the ending phase of the cycle ones hormone levels may take a longer time to recover. Furthermore, as a result of the aforementioned statement, I would consider hCG with your cycle - as long as you have an AI at hand to help increase the recovery process and reduce the aromatisation activity of the hCG.
Also, consider following Cdaddy7, GS's and Zewi's PCT protocol.

G&C’s Ultimate PCT:

12.5mg Daily continuing the two weeks between last test shot and PCT
Week 1 PCT 12.5mg Daily/Nolva 40 Daily/Clomid 100 Daily
Week 2 PCT 12.5mg Daily/Nolva 40 Daily/Clomid 100 Daily
Week 3 PCT 6.25mg Daily/Nolva 20 Daily/Clomid 50 Daily
Week 4 PCT 6.25mg Daily/Nolva 20 Daily/Clomid 50 Daily

Zewi’s Ultimate Tweak PCT:

12.5mg EOD continuing the two weeks between last test shot and PCT
Week 1 PCT 12.5mg EOD/Nolva 20 Daily/Clomid 100 Daily
Week 2 PCT 12.5mg EOD/Nolva 20 Daily/Clomid 100 Daily
Week 3 PCT 6.25mg EOD/Nolva 10 Daily/Clomid 50 Daily
Week 4 PCT 6.25mg EOD/Nolva 10 Daily/Clomid 50 Daily
You may consider running 6.25mg EOD on Weeks 1-4 if you feel 12.5mg is too strong. As suggested by Zewi

Additionally, deca is a universal compound, whereby it at high dosages it is considered a bulking compound and in contrast, at a low dose is a cutting compound.

Remember to stop the deca two weeks before you drop the test.

References:
(http://www.eroids.com/forum/steroids-qa/pct-anti-estrogens/announcing-gc...)

Hope this helps,
P