They are not a magic wand.
They definitely will not help everyone - they suppress appetite but if you eat through stress or boredom then they will likely not help.
There are different ones and one works better than others for some people.
I believe the NHS says to try it for 6 weeks and if it doesn’t work then to try a different one.
But OP you should not be using your credit card.
To get the benefits from them you’re looking at being on them for a good year or 2.
You’d need to slowly come off them once you’ve reached your goal weight and that could take a year in itself.
Posters hate to hear it but there are a lot of downsides to these and they are not going to work for everyone.
Firstly, the majority of diets can cause weight gain eventually but this is amplified by the WLIs and so people put the weight on faster and struggle to maintain it at all.
Imagine trying to lose or maintain weight with way stronger hunger pangs and food noise - you can’t reduce these and expect these not to massively come back.
Secondly, a lot of people put on weight due to emotional eating or boredom - no amount of WLIs will fix this. They may help in the short term but eventually those bad habits will catch up on them.
People don’t want to hear it but these WLIs like many fad diets are only a temporary fix.
You can get the same results, albeit slower and more difficult, through traditional methods but you’ll also find it easier to maintain.
The amount of people who’ve said they’ve wasted thousands of pounds because they’ve gone and put all the weight back on.
Do not get yourself in debt over something that is a temporary tool.
Instead focus on high volume foods, protein and lower carbs.
Our bodies were designed to eat.
Don’t suppress your appetite or eat too little ( this will mess up your metabolism, make you miserable and make you regain the weight) - eat as much food as you can within a calorie deficit.