Hey Marianne 💌
It's understandable that it can be a bit confusing with different messages in the description. Generally, vitamin C can be used both morning and night, but many prefer to use it in the morning for that protection against free radicals and sun damage.🌞
If the product specifically says it's best used in the evening, it might be because vitamin C can be a bit sensitive to light and varying temperatures, so evening might be a safe choice to get the most out of the ingredient🌙
In short: You can use it both ways!
Wishing you a great day ahead!