Protein Range

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.

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17 Item(s)

  • SiS WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon

    WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon

    100070
    1

    Regular Price: £9.00

    Special Price £4.68

  • SiS WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon

    WHEY20 78ml Mixed 4 Pack - Chocolate Orange & Caramel

    200705
    2

    Regular Price: £9.00

    Special Price £4.68

  • Overnight Protein Powder - 1kg (Choose your flavour)

    Overnight Protein Powder - 1kg (Choose your flavour)

    26650
    3

    Regular Price: £48.00

    Special Price £24.96

  • SiS Protein Bar 55g 20 Pack Chocolate & Peanut

    Protein Bar 20 Pack - Chocolate & Peanut

    009169
    4

    £40.00
  • SiS Protein Bar 55g 20 Pack Mint Chocolate

    Protein Bar 55g 20 Pack - Mint Chocolate

    009497
    5

    £40.00
  • SiS WHEY20 78ml 12 Pack

    WHEY20 - 12 Pack (Choose your flavour)

    22670
    6

    £27.50
  • Whey Protein Powder - 1kg (Choose your Flavour)

    Whey Protein Powder - 1kg (Choose your Flavour)

    26640
    7

    £25.00
  • L-Glutamine - 400g (Unflavoured)

    L-Glutamine - 400g (Unflavoured)

    100309
    8

    Regular Price: £18.00

    Special Price £9.36

  • WHEY20 78ml 8 Pack Bundle - Strawberry & Lemon

    WHEY20 78ml 8 Pack Bundle - Strawberry & Lemon

    sis-bundle-26t
    9

    £18.00
  • BCAA Perform - 250g (Pineapple)

    BCAA Perform - 250g (Pineapple)

    100305
    10

    £18.00
  • BCAA Perform - 250g (Summer Fruits)

    BCAA Perform - 250g (Summer Fruits)

    100306
    11

    £18.00
  • Creatine - 400g (Orange)

    Creatine - 400g (Orange)

    100307
    12

    £10.00
  • Creatine - 400g (Unflavoured)

    Creatine - 400g (Unflavoured)

    100308
    13

    £10.00
  • Protein Bar Bundle

    Protein Bar Bundle

    protein-bar-bundle
    14

    Regular Price: £12.00

    Special Price £6.24

  • Beta Alanine - 150 Tablets (Unflavoured)

    Beta Alanine - 150 Tablets (Unflavoured)

    100600
    15

    £20.00
  • Advanced Isolate + 1kg - Mint Chocolate

    Advanced Isolate + 1kg - Mint Chocolate

    100010
    16

    £45.00
  • Advanced Isolate + 1kg - Strawberry

    Advanced Isolate + 1kg - Strawberry

    100040
    17

    £45.00

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17 Item(s)