Nutribuddy is UK-based company. As such, all of our prices on our website are in GBP (£). This is indicated by the pound sign (£) before all prices on our website.
As a result when you pay in another currency such as USD the GBP amount is automatically converted into your local currency by your card company. I.e. £1 GBP converts to roughly $1.46 USD at the time of writing this.
To confirm, prices on the website are stated in GBP and prices on your statement will be in your local currency. Your card company will convert the GBP total to your local currency and that converted amount will show on your card statement.
You can check exchange rates at the link below. Remember, your bank will use their own exchange rates which might differ slightly.