
der Inhaltsstoff
ingredient
An individual component that a product is made of, especially in food, cosmetics, or medicines.
Ich habe eine Allergie gegen einen Inhaltsstoff in dieser Creme.
I have an allergy to an ingredient in this cream.
ingredient
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ingredient
An individual component that a product is made of, especially in food, cosmetics, or medicines.
Ich habe eine Allergie gegen einen Inhaltsstoff in dieser Creme.
I have an allergy to an ingredient in this cream.
The word is made up of 'der Inhalt' (the content) and 'der Stoff' (the substance/material). So it literally refers to a substance that makes up the contents of a product.
Der wichtigste Inhaltsstoff dieser Salbe ist Zink.
The most important ingredient in this ointment is zinc.
Common combinations are 'natürliche Inhaltsstoffe' (natural ingredients), 'künstliche Inhaltsstoffe' (artificial ingredients), or 'schädliche Inhaltsstoffe' (harmful ingredients). On packaging, you often find a 'Liste der Inhaltsstoffe' (list of ingredients).
Dieses Shampoo wirbt mit rein natürlichen Inhaltsstoffen.
This shampoo advertises that it contains purely natural ingredients.
This word is typically used for the components of industrially manufactured products, for example food, cosmetics, cleaning products, or medicines.
Manche Inhaltsstoffe in Fertiggerichten können Allergien auslösen.
Some ingredients in ready-made meals can trigger allergies.
component / part
Both words can refer to a contained part of a product. „Inhaltsstoff“ is the more precise term for an individual substance, especially in food, cosmetics, or medicines. „Bestandteil“ is broader and can also refer to other, non-material parts of a product or whole.

Auf der Packung steht, dass Wasser der wichtigste Inhaltsstoff der Creme ist.
The package states that water is the cream’s most important ingredient.
Die Verpackung ist ein sichtbarer Bestandteil des Produkts.
The packaging is a visible part of the product.