I am already subscribed, is it possible to change formulas during the course of my subscription?

Yes, you have the possibility to change formulas directly from your customer account. Simply log in, click on the profile icon (top right) and go to the "subscriptions" section. 

To change products, click on "change subscription" next to your current subscription and select the subscription you wish.

Important: any change will be taken into account if it is made 48 hours before the renewal date of your subscription.

To change your product, click on "change formula" next to your current subscription and select the desired formula. 

Important: any modification is taken into account if it is done 48 hours before the renewal date of your subscription.