Unfortunately youtube has become polluted with sketchy ads like this. The web site for this product states the following:

The Potent Eastern Elixir That Targets Stubborn Fat Quickly & Easily

Sadly there are no supplements that target fat cells. That is simply not how metabolism works. So immediately you should hold onto your wallet, because you are being told something that is not true. The only thing that targets fat cells are your mitochondria, which will use fat and sugar for fuel through a complicated system you were born with.

There are a list of ingredients that can indeed have somewhat of a beneficial effect on how your body metabolizes sugar. Sugar is the target here.

Unfortunately, if you continue to eat more than a small amount of sugar, there is no supplement that is going to fix that. The actual answer is to eat less sugar or other calories. This supplement can possibly help with taking the edge off your appetite, helping you eat less. It might help your body be a little more sensitive and handle glucose a little better, as long as you are taking it.

And by a little, I mean a little. Meaning not much.

When you stop taking it any beneficial effects will go away. And it will not reverse the long term damage sugar is doing to your body in the meantime.

But sugar is a fuel and one way or another, your body is either going to burn that fuel or store it.

Your body is smart like that. It does not like to waste fuel, since it used to be hard to come by. Nowadays it is much easier to get and it is easy to eat too much. Very easy and very cheap.

Potential side effects would depend on how much or how little you consume. Might be none, might be significant. Impossible to predict in advance. It depends on the individual.

If you eat too much sugar in any form, it will be converted to fat.

If you eat too much protein in any form, it will be converted to fat.

If you eat too much fat, it will be converted to fat.

So, the conclusion here is that a person would have to decide to change their diet, permanently, to target your fat cells. That is how Nagano Tonic works. Supplements cannot change basic biology. It is an individual decision.