Hey gal,
First and foremost I need to ask why you specified it not make you sick,
Sounds like a previous bad experience?
If so let us know the product so we can piece together what ingredients to potentially avoid.
Next up I want to ask you why you want one. I assume the end goal here is weight loss, and as such I am first strongly recommending that you master dietary control first.
Have you been dieting? Made progress?
Make sure you are able to maintain a calorie deficit on your own, and know how to track your intake, before jumping into spending money on fat-burners.
But you're here, and you may be more than ready so here are my fat-burner tips.
Don't expect these products to lose extra weight for you, that is entirely on you, your training, and your dietary adherence.
What they can offer is immensely valuable though, an energy boost, often mood-lift, and appetite suppression.
These (well formulated) products absolutely do, by many mechanisms, also prime your body to burn fat, but their biggest merits are in helping you stay energized and not hungry IMO.
A great product I will suggest here is PEScience Norcodrene,
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Great appetite suppression, smooth stimulant effects, for myself a good mood-lift as well.
I would go even further and suggest stacking that with Shift, but all down to your budget, most times you're best off with just one thing and spend the rest on quality food