Did you know that your mood is linked to a level of the vitamin D... ;)
Another source of Vitamin D is the algae... Chlorella & Spirulina, that you can use in your shakes or even salads.
In Paris, there is a great place to get the best one... Sol Semilla. And you can also find more interesting products like guarana or acai powder.
Thank you for the tips @evyxxx. I shall definitely check it out!