We sell these products, so start with the part that cuts against us.
The figure everybody quotes about Slenderiiz is quoted without its conditions. You will see it stated that the programme outperformed diet and exercise alone by a wide margin. The trial behind that ran for 12 weeks with 23 participants, and every one of them ate to a 1,250 calorie daily limit from an approved food list, exercised, and took a multivitamin, minerals, omega-3 and a zeolite and carbon supplement alongside the drops.
That is a study of a programme, and the programme includes eating 1,250 calories a day. Anything you read that gives you the result without the conditions has removed the part that does most of the work.
The longer version of this, including the review scores and what 31% of customers actually said, is on our Slenderiiz Drops review page.
What Slenderiiz is
Not a single product. It is a set of six, arranged into three phases, sold by Partner.Co and designed to be used alongside a calorie-controlled diet.
The centre of it is Slenderiix and Xceler8, two bottles that are usually described as one thing and are not. Slenderiix is a homeopathic preparation. Xceler8 is a conventional supplement with its own Supplement Facts panel: 600 mcg of B12, 100 mcg of biotin, and a 37.5 mg blend of green tea, ashwagandha and rhodiola. Describing the box as homeopathic, which the marketing has done for years, is wrong about half of it.
Two practical things about the drops that are easy to miss. The inactive ingredients include grain alcohol at 20%, and there is about 1 mg of caffeine per serving. Neither is a problem for most people and both are worth knowing before you order.
The three phases
This part is straightforward and is the reason to read this page.
Phase one, preparation: two days
Start the drops as directed and eat normally, minus anything you would call fast food. Two days, no calorie restriction.
Some versions of the programme add Restoriix here. If you take it, note the one instruction that matters: it contains activated charcoal, which binds things in the gut indiscriminately, so it needs a two-hour gap either side of any medication. That includes contraceptives and anything prescribed. This was not on the original version of this page, which recommended the product without it.
Phase two, fat burning: one to six months
From day three. The drops continue, eating moves to the approved food list at 1,250 calories a day, and the guidance is ten eight-ounce glasses of water.
1,250 calories is a substantial restriction for most adults, which is why nutrition during this phase is the part of the programme that actually needs the supplements. PureNourish is a meal replacement shake with 14 vitamins and minerals, protein, enzymes and fibre. Giving Greens is a vegetable powder. Power Boost is a higher-protein cocoa addition built on L-glutamine, and Beauty Boost is an orange-flavoured one formulated around hair, skin and nails.
The approved food list is on this site so you can read it before deciding whether the eating side is something you would stick to, which is the real question.
If you are eating 1,250 calories a day, talk to a doctor first. That is a low intake to hold for months, and it is a different proposition depending on your size, your medication and whether you are managing any condition. A website is not the right adviser on that.
Phase three, maintenance
Reintroduce foods gradually and keep eating well. There is no trick to this phase and the programme does not pretend there is. It is also where most weight-management programmes come apart, which is worth knowing going in rather than afterwards.
Does it work
The honest answer is that calorie restriction works, and the programme is built around calorie restriction. The supplements support eating that little without becoming deficient, and the drops are positioned as help with the hunger and the flatness that come with it.
What we are not going to tell you is that the drops cause the weight loss, because the trial that is quoted at you cannot separate them from the 1,250 calories, the exercise and the four other supplements. We did the same exercise across all four of Partner.Co's clinical studies in Reading the Research.
Harvard Health's summary of why diets do not work is worth reading alongside this, because the failure mode it describes applies to this programme as much as any other.
What people who have actually used it report, including the ones it did not work for, is in Slenderiiz drops, realistic results.
What it costs
The full stack, all six products together, runs to several hundred dollars a month. The drops on their own are considerably less, and plenty of people run the programme with the drops and the food list and nothing else.
Current prices are on the product pages rather than quoted here, since a price typed into an article goes stale the moment it changes.
Slenderiiz Day and Night Drops carry a 45-day money-back guarantee rather than the usual 30, which is the one place the manufacturer has put its own money behind the programme's timeline.
What you will not find here
We do not publish before and after photographs, for the reason set out on the review page: a transformation photograph implies a typical result where none has been established, and any photograph taken inside that trial is a photograph of eating 1,250 calories a day with exercise and four other supplements.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
More on this subject: Weight Management