Vitamins, Health & Nutritional Supplements

Vitamins, Health & Nutritional Supplements

Our nutritional supplements and vitamins are great for addressing deficiencies and providing a much-needed boost to your diet. Whether you prefer powder, gummies, tablets or capsules, our variety of supplements offer a multitude of benefits to your health.

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5 Products

  1. Daily omega 3 can contribute to heart and cardiovascular health. Each tub contains 60 softgels giving you 60 days supply with a suggested use of 1 per day.
    Daily Omega 3
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    Special Price £8.07 Was £9.49
  2. Pro bio+ capsules  support healthy gut function. 30 capsules per tub with a suggested use of 1 per day. They are high strength with 42 billion CFU cultures.
    Pro Bio+ Capsule
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    Special Price £18.74 Was £24.99
    Beta Alanine - 90 Tablets
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    Special Price £12.74 Was £14.99
  4. Immune Tablets - Orange
    Immune Tablets - Orange
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    Special Price £6.80 Was £8.00
  5. SiS Immune - 8 Pack (Orange)
    SiS Immune - 8 Pack (Orange)
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    Special Price £51.00 Was £60.00
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5 Products

Vitamins & Supplements

The products in our range have been chosen by our experts to ensure that they are ideal for reaching your fitness goals and enhancing your overall well being. Vegans or those with special dietary intolerances or allergies may opt for health supplements if they are not getting enough Vitamin D or calcium. During the winter months, a lack of sunlight may make it difficult to get enough Vitamin D, so this is a popular nutritional supplement for lots of people too. Whatever area you’d like to address, browse our health and performance supplements today.


Supplementing can help you reach your fitness goals and enhance your overall well being. Our Performance Multivitamin is the perfect option for endurance athletes looking to meet their nutritional needs, with 19 key vitamins and minerals. These vitamins offer a multitude of benefits to your health, including supporting the normal functioning of the immune system, reducing tiredness and fatigue, maintenance of normal bones and muscle function, and normal protein and glycogen metabolism. 

Our Vitamin C tablets are fantastic for maintaining the normal function of your immune system and contribute to the reduction of tiredness and fatigue. Vitamins A, B, C, D and E are important for hair growth, alongside iron and zinc. 


You probably know by now that at SiS, we’re all about science. There is scientific evidence that health supplements work best when taken at particular times. For example, it is often recommended that you take multivitamin supplements in the morning as B Vitamins can be too stimulating for the brain before bed. Water soluble vitamins like B Vitamins and Vitamin C absorb best on an empty stomach, so you should take these around two hours prior to your meal or first thing in the morning.


Our regularly updated blog is packed with relevant information about all your favourite sports, including cycling, swimming and running. This is where our experts come together with key insights and advice. If you have any questions about our products and the best choice for your lifestyle, you can get in touch with our team today for personalised expert advice.

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