Hello!
In this guide, we will explore SCP-330 and what it has to offer.
You will learn about each candy type and it's effects, as well as the best situations to use them in.
As of writing, there are currently 7 candy types (excluding halloween exclusives).

So, before we learn about the various candy types available through SCP-330, what the heck is SCP-330 anyway?

Well, my friend, SCP-330 is an anomalous candy bowl found in Light Containment Zone. It can be found in the room labelled 'TC01', Test Chamber 01.

TC01 is split up into 2 rooms: the Control Room and the Testing Room. In order to gain access to the testing room, a button in the Control Room must be pressed. In order to gain access to the control room, a Scientist Keycard is needed.
TIP: Inside the Control Room, you can find some Combat Armour, as well as a Zone Manager Keycard both lying on the desk. There is also a chance for the COM-15 to spawn on the desk, as well as an SCP Item pedestal to spawn in the corner of the room.

Inside the testing room, you can finally find SCP-330. Interacting with it will give you one random type of candy. Don't be greedy, however, as taking more than 2 pieces of candy will result in you losing your hands and bleeding to death.

Now we know just what SCP-330 is, and you're ready to learn about all the candy types available from it. Ready? Here we go!

Red Candy

Red Candy is often ignored when obtained, however it can be proven useful in many situations.
Red Candy is essentially just Painkillers but obtainable through SCP-330.
Upon consumption, the player will recieve 45 HP Regeneration: 9 HP/s for a total of 5 seconds.
There's not much else to really talk about with Red Candy: it's just a different version of painkillers that is rarely used.

Blue Candy

Blue Candy is one of the most useful candies you can obtain through SCP-330.
Consuming it will give you 30 AHP, and as a bonus, the AHP does not decay, meaning it can only be removed when you're damaged. You can stack Blue Candy AHP up to 75 AHP.
In my opinion, it is best to consume it straight away, however it is sometimes best to save it for when you really need it.

Green Candy

This is by far the most broken candy in the game, and most don't realise it.
Consuming it will give you the 'Vitality' effect: resulting in all negative status effects being removed for 30 seconds, and you also receive HP Regeneration: 1.5 HP/s for 80 seconds, resulting in a total of 120 HP.
So, why did I call this candy broken? Simply put: you can avoid getting SCP-106s 'Traumatised' effect if you escape his pocket dimension, as long as you still have the Vitality effect upon attempting your escape. This means that should SCP-106 find you again, he'll have to take you back to his pocket dimension instead of one shotting you.

Yellow Candy

Yellow candy is essentially a watered down adrenaline. You can't survive SCP-049s attack with it, but it gives you a helpful speed boost and stamina replenishment. This candy can be very useful if used right during intense chases.

Purple Candy

Probably the most underrated candy, Purple Candy does have its benefits:
Purple candy provides HP Regeneration: 1.5 HP/s for a total of 10 seconds, resulting in 15 HP total.
It also provides the user with Damage Reduction for a total of 15 seconds.
It may seem weak at first, but can prove its worth during gunfights.

Rainbow Candy

Rainbow candy grants the user with the most benefits out of any other candy:
The user instantly is restored 15 HP, and is given the 'Invigoration' status effect for a total of 5 seconds. The user is also permanently given the Bodyshot Reduction status effect, as well as 20 AHP that does not decay for 10 seconds.

I could be wrong, but I believe this also stops SCP-049s attack.

Pink Candy

By far the most overrated candy, and for a good reason.
Upon consumption, the player explodes, damaging nearby enemies heavily and destroying any nearby doors.
About to die to an SCP? Pink Candy.
Guards KoSing and are coming for you next? Pink Candy.
MTF coming down the elevator? Pink Candy.
Want to open armoury for your fellow Class-D? Pink Candy.

Pink candy has so many uses that it is easily the funniest and best candy in the game.

And, that's a wrap!
Thanks for reading this guide, and I hope you are know much more educated on SCP-330s properties and abilities.
I do have some other guides, so please do check them out if you have the time!
It should also be noted that SCP-330 does have some other candies, however they are halloween exclusive so I have not included them. I may make a seperate guide in the future exclusively detailing the Halloween candies.