Best Sellers

At Science in Sport, we’re committed to research, testing, and certification. By working with the elite athlete community, we create performance-driven products that meet your nutritional needs and support your training goals. 


Our best-selling products are widely trusted across the globe, helping ambitious athletes from a wide range of disciplines to take their training to the next level. Through our world-leading and relentless research, we formulate products that will truly impact your performance. Discover the benefits of SiS today with our best-selling products.

 

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16 Products

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Price
  1. Protein Bars
    Protein Bars
    4 Flavours
    Subscribe: Up to 25% off
    From £28.04 From £32.99
    Save 15%
  2. Beta Fuel Bundle
    Beta Fuel Bundle
    £60.05 Was £70.65
    Save 15%
  3. REGO Bundle
    Recovery Protein Bundle
    £45.04 Was £52.99
    Save 15%
  4. REGO Rapid Recovery Strawberry - 500g
    REGO Rapid Recovery Strawberry - 500g
    Save 15%
    Special Price £16.99 Was £19.99
  5. PROTEIN20 Bar - 12 pack
    PROTEIN20 Bar - 12 pack
    3 Flavours
    Subscribe: Up to 25% off
    From £28.04 From £32.99
    Save 15%
  6. SIS Mixed Isotonic 20 Gel Pack
    Mixed GO Isotonic Energy Gels - 20 Pack
    Subscribe: Up to 25% off
    Save 15%
    Special Price £26.78 Was £31.50
  7. SiS Immune - 8 Pack (Orange)
    SiS Immune - 8 Pack (Orange)
    Save 15%
    Special Price £51.00 Was £60.00
  8. BETA ALANINE
    Beta Alanine - 90 Tablets
    Save 15%
    Special Price £12.74 Was £14.99
  9. Go Hydro (Pink Grapefruit)
    Go Hydro (Pink Grapefruit)
    Save 15%
    Special Price £6.38 Was £7.50
  10. GO Isotonic Energy Gel Variety - 7 Pack
    GO Isotonic Energy Gel Variety - 7 Pack
    Save 15%
    Special Price £10.63 Was £12.50
  11. 800ml SiS Pro Yellow Cycling Bottle
    Pro Yellow Bottle - 800ml
    Save 15%
    Special Price £4.25 Was £5.00
  12. GO Hydro x 3 (Lemon)
    GO Hydro x 3 (Lemon)
    Save 15%
    Special Price £18.70 Was £22.00
  13. Immune Tablets - Orange
    Immune Tablets - Orange
    Save 15%
    Special Price £6.80 Was £8.00
  14. Beta Fuel Energy Chew
    Beta Fuel Energy Chew
    5 Flavours
    Subscribe: Up to 25% off
    From £1.87 From £2.20
    Save 15%
  15. Go Hydro (Pineapple & Mango)
    Go Hydro (Pineapple & Mango)
    Save 15%
    Special Price £6.38 Was £7.50
  16. GO Energy + Caffeine Gel - 30 Pack - Double Espresso
    GO Energy + Caffeine Gel - 30 Pack - Double Espresso
    Subscribe: Up to 25% off
    Save 40%
    Special Price £33.60 Was £56.00
16 33 48 View All

16 Products

Premier Delivery Just £9.99 For A Year Of Next Day Delivery!