Protein Range

Protein is essential for endurance athletes, to ensure your muscles are rebuilt after your activity. Our range of proteins is 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 – SiS WHEY20.

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18 Item(s)

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

    SiS WHEY20 78ml Mixed 4 Pack - Strawberry & Lemon

    100070
    1

    £8.00

    Out of stock

  • SiS Overnight Protein 1kg Cookies & Cream

    SiS Overnight Protein 1kg - Cookies & Cream

    100303
    2

    £48.00
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  • SiS Protein Bar 55g 20 Pack Mint Chocolate

    SiS Protein Bar 55g 20 Pack - Mint Chocolate

    009497
    3

    Regular Price: £40.00

    Special Price £32.49

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  • SiS Overnight Protein 1kg Chocolate

    SiS Overnight Protein 1kg - Chocolate

    016112
    4

    £48.00
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  • SiS WHEY20 78ml 8 Pack Bundle - Strawberry & Lemon

    SiS WHEY20 78ml 8 Pack Bundle - Strawberry & Lemon

    sis-bundle-26t
    5

    £16.00
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  • SiS Protein Bar 55g 20 Pack Chocolate & Peanut

    SiS Protein Bar 55g 20 Pack - Chocolate & Peanut

    009169
    6

    £40.00
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  • SiS Overnight Protein 1kg Vanilla

    SiS Overnight Protein 1kg - Vanilla

    016716
    7

    £48.00
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  • 50 Pack Bar Bundle

    50 Pack Bar Bundle

    sis-bundle-11t
    8

    Regular Price: £75.00

    Special Price £64.99

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  • Protein Bar Bundle

    Protein Bar Bundle

    protein-bar-bundle
    9

    £12.00
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  • SiS WHEY20 78ml 12 Pack - Strawberry

    SiS WHEY20 78ml 12 Pack - Strawberry

    100069
    10

    Regular Price: £24.00

    Special Price £19.99

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  • SiS WHEY20 78ml 12 Pack - Lemon

    SiS WHEY20 78ml 12 Pack - Lemon

    100068
    11

    Regular Price: £24.00

    Special Price £19.99

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  • SiS Advanced Isolate + 1kg Strawberry

    SiS Advanced Isolate + 1kg - Strawberry

    100040
    12

    Regular Price: £45.00

    Special Price £39.99

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  • SiS Whey Protein 1kg Chocolate

    SiS Whey Protein 1kg - Chocolate

    015115
    13

    Regular Price: £25.00

    Special Price £19.99

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  • SiS Whey Protein 1kg Vanilla

    SiS Whey Protein 1kg - Vanilla

    015719
    14

    Regular Price: £25.00

    Special Price £19.99

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  • SiS Whey Protein 1kg Strawberry

    SiS Whey Protein 1kg - Strawberry

    015016
    15

    Regular Price: £25.00

    Special Price £19.99

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  • SiS Advanced Isolate + 1kg Mint Chocolate

    SiS Advanced Isolate + 1kg - Mint Chocolate

    100010
    16

    Regular Price: £45.00

    Special Price £39.99

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  • Advanced Isolate + Bundle

    Advanced Isolate + Bundle

    sis-bundle-13t
    17

    Regular Price: £100.00

    Special Price £74.99

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  • Whey Protein Bundle

    Whey Protein Bundle

    sis-bundle-14t
    18

    £49.00
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18 Item(s)