Hai Guyz!

So stat boosters are awesome, obviously. But I'm wondering if it's worth using them on lower-tier pets. My battle pet is tier2, and I've used some boosters, but it just felt like a waste when I can (basically) get the same results from training.

Also, if a stat is trained to the max it can go according to the training centre, are boosters still effective?

Level has no effect as to how many stats you can get from boosters, but I would say waiting until around tier 8 would be a good time to use them since your pet will gain less stats from the combination of battle quests and training. Intelligence boosters are worth using at any point in time since they have no effect on tiers and training capabilities.

Thank you, sir! You've been very helpful :)

it is more or less wasteful to use boosters at a low tier. I do suggest using auto-training if you have money to spare and want to get faster gains and more for your money. auto training starts to diminish in value as level goes up so keep an eye on how much csc per stat point/training session it's costing you (it'll go up QUICK). Boosters you can hoard til around t8 like mrcool said. at that point training is slower, autotraining isn't worth it and most of your stats are coming from BQs, so boosters have much more value to your pet then as it's not as easy for it to gain stats.