Protein

Protein is essential for endurance athletes, to ensure your muscles are rebuilt after your activity. Protein products are designed to suit every goal and budget, including Whey Protein, our premium Whey Protein Advanced Isolate +, great tasting Overnight Protein, delicious Protein Bars and the biggest innovation in protein for years – WHEY20. All available in a wide range of sizes and flavours!
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  1. SiS Protein Bar 55g 20 Pack Mint Chocolate
    Protein Bar - 20 Pack (Mint Chocolate)
    50% Off
    Was £40.00 Special Price £20.00
  2. SiS Protein Bar 55g 20 Pack Chocolate & Peanut
    Protein Bar - 20 Pack (Chocolate & Peanut)
    50% Off
    Was £40.00 Special Price £20.00
  3. SiS Whey Protein 1kg Strawberry
    Whey Protein Powder 1kg Tub - Strawberry
    40% Off
    Was £30.00 Special Price £18.00
  4. SiS Whey Protein 1kg Vanilla
    Whey Protein - 1kg (Vanilla)
    40% Off
    Was £30.00 Special Price £18.00
  5.  Whey Protein - 1kg (Pineapple & Coconut)
    Whey Protein - 1kg (Pineapple & Coconut)
    40% Off
    Was £30.00 Special Price £18.00
  6. SiS Whey Protein 1kg Chocolate
    Whey Protein Powder 1kg Tub - Chocolate
    40% Off
    Was £30.00 Special Price £18.00
  7. SiS Advanced Isolate + 1kg Strawberry
    Advanced Isolate+ - 1kg (Strawberry)
    45% Off
    Was £45.00 Special Price £24.75
  8.  Advanced Isolate+ - 1kg (Chocolate Orange)
    Advanced Isolate+ - 1kg (Chocolate Orange)
    45% Off
    Was £45.00 Special Price £24.75
  9. SiS Advanced Isolate + 1kg Mint Chocolate
    Advanced Isolate+ - 1kg (Mint Chocolate)
    45% Off
    Was £45.00 Special Price £24.75
  10.  WHEY20 - 12 Pack (Caramel)
    WHEY20 - 12 Pack (Caramel)
    50% Off
    Was £27.50 Special Price £13.75
  11. WHEY20 - 12 Pack (Chocolate Mint)
    WHEY20 - 12 Pack (Chocolate Mint)
    50% Off
    Was £27.50 Special Price £13.75
  12. WHEY20 - 12 Pack (Peanut Butter)
    WHEY20 - 12 Pack (Peanut Butter)
    50% Off
    Was £27.50 Special Price £13.75
  13.  WHEY20 - 12 Pack (Chocolate Orange)
    WHEY20 - 12 Pack (Chocolate Orange)
    50% Off
    Was £27.50 Special Price £13.75
  14.  WHEY20 - 12 Pack (Lemon)
    WHEY20 - 12 Pack (Lemon)
    50% Off
    Was £27.50 Special Price £13.75
  15.  WHEY20 - 12 Pack (Strawberry)
    WHEY20 - 12 Pack (Strawberry)
    50% Off
    Was £27.50 Special Price £13.75
  16. SiS Overnight Protein 1kg Vanilla
    Overnight Protein - 1kg (Vanilla)
    30% Off
    Was £48.00 Special Price £33.60
  17. SiS WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon
    WHEY20 Mixed - 4 Pack (Chocolate Orange & Caramel)
    40% Off
    Was £9.00 Special Price £5.40
  18. SiS WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon
    WHEY20 Mixed - 4 Pack (Strawberry & Lemon)
    40% Off
    Was £9.00 Special Price £5.40
  19. SiS Overnight Protein 1kg Chocolate
    Overnight Protein - 1kg (Chocolate)
    30% Off
    Was £48.00 Special Price £33.60
  20.  Overnight Protein - 1kg (Cookies and Cream)
    Overnight Protein - 1kg (Cookies and Cream)
    30% Off
    Was £48.00 Special Price £33.50
  21.  WHEY20 - 12 Pack (Mango & Passion Fruit)
    WHEY20 - 12 Pack (Mango & Passion Fruit)
    50% Off
    Was £27.50 Special Price £13.75
  22. SiS SmartShake (600ml)
    SmartShake (600ml)
    £10.00
  23. Protein Bar Bundle
    Protein Bar Bundle
    30% Off
    Was £12.00 £8.40
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