Go to Body engineering section in your hideout.

Select an agent you want to use chemicals on. You should see a similar picture. My agent, actually this is undercover Antonio Banderas, gladly agreed to help for this guide.


Now we need few parameters from this picture. These are 4 agent stats marked red:
Circulatory Respiratory
Sensory Motoric

These 4 main stats lead to 8 other derivative stats:

• Max action points
  
• Max fire points
  
• Damage treshold
  
• Dodge cost
  
• Max hit points
  
• Movement range
  
• Max awareness
  
• Awareness regen

BUT. Because this is not chapter 1 (start of the game) this agent seems to have quite high stats, which may look ok. With game progressing through chapters you will start to see agents for hire with better stats than your starting ones. That is quite logic, because they (agents) do not waste time and use compounds on their own, while not working in your organization. Though you cannot know their history, what they used and how to possibly continue saving time and money.

To unveil real abilities of an agent you have to run a "detox" on them and inject correct chain of compounds, which raise their stats much better.

NB! Using of compounds is best to start when you are in chapter 5 and later, because only then you have first compound chains to discover.

To do that we need discover a "compound" named Remove all, then find it in compounds list and select it.
DO NOT ASSIGN IT TO AGENT YET!
It will show real agent stats as it be a chapter 1 and we need these 4 numbers marked red.

If you are decided and ready to detox agent, you can assign Remove all. Just know it takes longer the more compounds agent is used already.

So from previous section we take 4 numbers with us: Circulatory 53, Sensory 50, Respiratory 54 and Motorics 59.

Open this calculator[raszpl.github.io] in your browser.

In there you should see a black calculator and chains of compounds below it. Moving mouse over them calculator will show how stats will change if you feed given chain to an agent, based on his main 4 stats. You also can press on any compound to make it count IN or OUT from whole chain, for example early on you will start to discover only few compounds. So marking them here will allow you to see what chain can be started or applied at given time and what changes it will bring.

OK, now let's go on with our agent. We ran our poor agent through a detox and now we have:
Circulatory 53
Sensory 50
Respiratory 54
Motoric 59

Pretty low for end-game agent with price of few thousand of money. He barely can move and shoot. But this soon will change.

Enter these numbers into calculator and lets choose best chain of compounds for agent.

Move mouse over different lines which are precalculated compound chains to select one that suits you best, given what compounds you have discovered at the moment. As this example is from Chapter 7, I have found all compounds and agent may have better stats (shown in green) now:
Circulatory 202
Sensory 169
Respiratory 184
Motoric 148

And derivative stats changed drastically - agent now has 4 action points instead of 2, 3 fire points instead of 1 and almost doubled amount of hit points and awareness. Also his damage threshold have risen to 13 and dodge cost is lowered from 34 to only 16 awareness points. Plus his awareness regen have risen slightly by 9 points. So this is some terminator, not an agent already.

NB! Please note movement range rise from 6 to 9. This is not correct. Actually it might be 6 or 5 only (yes, it may happen to be even lower than starting number) Why it happen so, I do not know, but rest assured, even then agent will start walk farther distances, so it might be a bug in game or in calculator.

Now lets see how it looks when you are in chapter 5, when you just start to discover a compounds. After some time even then you can slightly alter your agents

Selected chain shows what stats our agent will have even if we have not discovered Anadrol yet.
At given time (chapter 5) I strongly suggest to altering few your most used agents, because there is one mission where you wish your agents could walk longer distances. Even when these chains seems incomplete, it still can make difference when shooting phase starts.

This is obvious and intuitive. Select and assign first chemical, then next one and so on. I made a table in Excel for myself with checkboxes for every chemical. It helps, if I forget which agent used which chemical at any given time, because when you run 4 agents simultaneously in body engineering section, other events do not stop from happening and all this may distract you, resulting in using wrong chemical or blocking other chemicals if you forget correct order.

Also it is good to write it down when you are experimenting. I did a bit of that with early compounds, trying to get better results after applying the selected chain.

And here is our poor agent after we fed him quite a long shelf of chemicals.

And here is what was calculated for him (I decided to use different chain, not the one as shown in previous pictures)

Max hitpoints, max awareness and awareness regen is higher than calculated, because of perks. And movement range is 6 instead calculator predicted it should be 9. So this is how it is, anyway he walks at longer distances now.

Here are few resources from the internet that helped to me

Best perks, what you want and not[re-actor.net]

General info on Body engineering from Fandom Wiki[phantom-doctrine.fandom.com]

Phantom Doctrine Intel Google spreadsheet[docs.google.com], with aggregated info from Reddit users posts.



So, Thank You, Dear Reader and I hope this guide helped at least a bit.