We want to give you lots of payment options when you're shopping with us at Science in Sport.

Better your budgets with Pay Later from Klarna!

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Browse our wide range of award-winning sports nutrition, expertly designed to suit all of your performance needs.

Not sure where to start? Check out our fitness guide to help you choose the right nutrition needed for your goals and sport.

Once you’ve found what you need to fuel your training, add it to your bag and go to the checkout.



Select your Klarna payment method of choice - don't worry, you won't have to create a klarna account if you don't want to.

Place your order and you're done. Easy.

TIP: Just tap 'Change' under payment type and then 'Add New Payment Method.'


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man in the gymman in the gym



Once your order's been sent, you'll have 30 days to pay Klarna, and you'll get a reminder before payment is due.

There's zero interest, fees or late-payment charges - always.*


TIP: If you return any items on your order, your Klarna statement and schedule will be updated.


  • A UK bank account
  • To be 18 years of age or over
  • A UK residential address

*Ts&Cs apply to both brands.

If you have any trouble placing an order with Klarna, it could be due to one of the following reasons:


  • Klarna Payments are subject to your financial circumstances. Klarna may reject your application to Pay Later. We'd recommend choosing another type of payment or placing an order for a smaller amount.
  • You may have outstanding payments on previous Klarna purchases.
  • You may have missed a required field at the checkout, such as filling in your date of birth.


If you have trouble with your order, please contact SiS Customer Service.

Please note that Klarna is an independent payment company and SiS has no influence over whether your payment with Klarna is accepted or not.