We often tend to use too much productThis is unnecessary for your skin and wasteful for both the planet and your wallet.
Remember: just because a product lathers more doesn't mean it's more effective in terms of cleaning. What counts is its washing properties and therefore the surfactant used!
For a shower gel, the equivalent of a nut in the palm of the hand to spread over the body.
For a shampoo or conditioner, the equivalent of a 2€ coin (or a little more if your hair is very long)
For toothpaste, a pea-sized dose will be enough.