Nivea is a very popular brand for lip balm, but no, their products are not vegan (at least not currently).
The biggest issue is that they likely test on animals, which is a deal-breaker.
Many of their products also contain beeswax.
For example, here’s an extract from their moisture lip care lip balm ingredients:
… Beeswax, Glycerin, Water, Fragrance
And beeswax is clearly not vegan.
The rest of their products have glycerol in them. Now, glycerol can be vegan, and often is, but when a company doesn’t specifically label it, I’d rather be on the safe side and assume it’s not vegan.
In summary: Nivea’s lip balms are not vegan due to testing products on animals, and having beeswax in most products. Some of their lip balms may be vegan, but why take the chance when there are many better vegan lip balms to choose from.