I saw this in another forum and wanted to get the BOP take on it, so please give it a read and see if it makes any sense to you.

"I wanted to post some information on frontloading as it is something which is seen as an advanced technique but rather I would see that it is very easy and calling it advanced means that you just need to learn more. A lot of the information gathered was exposed to me by Bill Roberts. The purpose of frontloading is to get to the dose you want to metabolize quicker. Waiting 3-5 weeks for the half-lives to build is tedious and unnecessary. pct with dosages as 40/40/20/20 is not needed. If you want to metabolize 40 mg/day on week one then adjust the amounts so you do. Manipulate the dosage according to the half-life so you metabolize the amount you desire. This is important with clomid as it is typically used just for two weeks and by that time it will just have reached the level you want.


The following chart measures how much of testosterone Enthantate you metabolize in Week 1 of a 500mg/week cycle. This was taken from a steroid calculator and the numbers include a 5% waste factor and the numbers may be off by a little but the big picture is the focus.

Day 1: Inject 250 mg of Testosterone Enthantate Metabolize 26 mg
Day 2: Metabolize 23 mg
Day 3: Metabolize 21 mg
Day 4: Inject 250 mg of Test Enthantate Metabolize 44 mg
Day 5: Metabolize 39 mg
Day 6: Metabolize 35mg
Day 7: Metabolize 31 mg

For Week 1 you metabolized only 219 mg of Test E when your goal is 500.

The following is the amount metabolize week 1 when frontloading:
Day 1: Inject 600mgs Test Enthantate Metabolize 62 mg
Day 2: Metabolize 55 mg
Day 3: Metabolize 49 mg
Day 4: Inject 250 mgs Test Enthantate Metabolize 70 mg
Day 5: Metabolize 62 mg
Day 6: Metabolize 55 mg
Day 7: Metabolize 49 mg

For Week 1 when frontloading you will metabolize 402 mg of Test E when your goal is 500. Much better in my opinion.

The Formula

To establish the amount you should inject/ingest on the first day of frontloading you can use a the following formula to calculate the value. IT IS ONLY THE FIRST DAY YOU INJECT THIS AMOUNT. After that you follow your regular injection schedule.

Weekly amount/7xHalf-life in days + regular inject amount = Frontload

For measuring SERMs/AIs this formula is easier to use

Daily amount x half-life + regular dose = Frontload

Example, I am going to do 12 weeks of 500mgs Test E/week, planning on injecting 250 mg Monday and Thursday. How much should I frontload? Using the formula I plug in my values.

500/7 x 5 + 250 = Frontload

71 x 5 + 250 = Frontload

357 + 250 = Frontload

607 = Frontload

Now to get the help get the exact amount of 607 I recommend diluting 1 ml of 250mg/ml Test by adding 7 ml cottonseed oil so you now have a solution which is 31mg/ml and grab your insulin needle and measure 23units(0,23ml) add this volume to your 600 mg of test and you now have your dose measured(607mg). Just kidding you can just round to 600 or whatever number is easier for you.

To assist in your usage of the formula I will include some half-lives. Note, there is a slight variation of half-lives depending on the source. The fact that it is measured in days and not hours grants a +-12 hour variation which isn't too accurate either.

Testosterone Enthantate: 5 days
Testosterone Cypionate: 5 days(The difference between Test E and Test C is rather trivial and this is where the aforementioned -+12hour difference comes into play).
Decanoate(Deca): 6 days (I thought it was a little higher but most medical literature state 6 days)
Boldenone Undecylenate: 14 days

tamoxifen Citrate(nolvadex): 5 days You ingest, DO NOT INJECT
clomiphene citrate(Clomid): 5 days You ingest, DO NOT INJECT
Anastrozole (arimidex): 2 days You ingest, DO NOT INJECT
letrozole (Letro, Femara): 2 days You ingest, DO NOT INJECT
hcg: 33hours to 48 hours depending on intramuscular or subcutaneous injection

The latter 3 might not need to be frontloaded but I felt the need to post them anyway.

Also I wanted to incorporate a cheat sheet for the most common ones and those who don't want to read through all this wall of text and learn how to do it. Going to list the Compound and Weekly dosage you wish to do and then the amount you should inject assuming an equal amount is injected twice a week.

Test E/C: 500 mg/week 607 mg on the first day only.
Test E/C: 600 mg/week 678 mg on the first day only.
Test E/C: 750 mg/week 910 mg on the first day only.
Test E/C: 1000 mg/week 1214 mg on the first day only.

Boldenone(equipoise):400mgs/week 885 mg on the first day only
Boldenone(Equipoise):500mgs/week 1107 mg on the first day only
Boldenone(Equipoise):600mgs/week 1328 mg on the first day only
Boldenone(Equipoise):750mgs/week 1660 mg on the first day only

Tamoxifen Citrate(Nolvadex): 20 mg/day 120 mg on the first day only You ingest, DO NOT INJECT

Clomiphene citrate(Clomid): 50 mg/day 300 mg on the first day only You ingest, DO NOT INJECT

This is a post by @Sworder from 2011"

Taken from
https://thinksteroids.com/community/threads/need-help-with-a-front-load.134385471/