There are 8 basic types of Serums in the game.
You can improve the potency of your Serums by combining two Serums of the same level and type in order to get one new Serum of a higher level. By repeating this process, you can upgrade Serums to a maximum Level of 12. The higher the level of the Serum, the better the bonus it will grant to your forces once activated.

To combine Serums, go to your Genetics Lab, open the "Biolab" tab, and choose the Serums you wish to fuse. You will also be able to see the bonus you will receive once the Serums are combined together. Click "Fuse" to produce the higher level Serum. Once fused, the Serum will be immediately sent to Cold Storage.
ATTENTION: To upgrade the Serums of higher levels you need to upgrade the Genetics Lab.

You can receive Serums by:
- Purchasing them at the Black Market within the "Misc." tab (get Cryonic Containers which have Serums in them);
- Participating in Global Tournaments;
- Challenging other Clans;
- Attacking or defending Infestations;
- Other game interactions.

All Cryonic Containers acquired will be sent to your Cold Storage within the Genetics Lab, where you may open them and extract the Serums.

To use and store Serums, you must first build the Genetics Lab. To view a Serum's attributes, simply place your cursor over it. To apply any Serum and benefit from its bonuses, simply place it into any open Activation Slot on the Activation Board. Be advised: You will need a Centrifuge to open additional Activation Slots. Active Serums grant permanent bonuses, and will not disappear from slots unless you decide to remove them.

Once applied, you can only safely remove Serums and return them to your Cold Storage with the help of special tools – Injectors. This tool can be purchased from the Black Market. Removing the Serums without the help of an Injector will result in the Serum being permanently destroyed!

Keep in mind that there are two types of Injectors:
Auto Injectors Beta can safely remove Serums of Level 5-8
Auto Injectors Gamma can safely remove Serums of Level 5-12

WARNING: Each Injector is "single-use" only and may be used to extract only ONE Serum.