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Hydration 101 And Why It Matters

11th May 2021

11th May 2021

By Shivraj Bassi

Hydration = life. It really is as simple as that. Your body is mostly made up of water, comprising two thirds of a man’s body and around half of a woman’s. That feeling you get of being at home when you sink into a bath or splash into the ocean? It’s because you are made of water. 

Water does too many things within your body to count. You can thank the stuff for controlling your temperature, transporting nutrients, removing waste and keeping your joints working smoothly. If you’re not adequately hydrated, your body and mind can’t perform at their highest level. 

The importance of hydration grows even further if you exercise, whether that’s a bike ride around your local park or high level competitions. There’s a lot to consider, such as the benefits of coconut water and other sports drinks, and how much fluid you should be drinking before, during and after exercise

Here, we explore the basics of hydration and why it matters, and look at why it’s so important in the context of being active. 

How Much Water Should I Drink?

As a general rule, adults need to drink 2-2.5 litres of fluid a day. If an average-sized glass is 250ml, that’s 8-10 glasses a day. The exact amount your body needs depends on factors such as your age - the older you get, the more water you tend to need, as your body is able to store less of it - the climate and how warm it is, any medical conditions you may have and how active you are. 

You have to replace all of the fluid your body loses every day, which includes 1.5 litres lost when you pee and around 500ml lost from sweat, more if it’s hot. You even lose fluid just from breathing. 

It’s a good idea to get into the habit of sipping from a glass or bottle of water every few minutes, to provide your body with frequent hydration. Carrying water with you can also be a good reminder to drink up. 

How To Stay Hydrated

Photo by Nigel Msipa on Unsplash

It might sound easy: to stay hydrated, you drink water. But it’s not quite as simple as that. Many fluids rehydrate you, from tea and coffee, to sports drinks, soups, stews and fruit and vegetables, and what’s best to consume when you’re looking at how to rehydrate differs depending on circumstance. 

Water is, of course, the obvious choice and almost always the best choice. It’s calorie-free and free-free, if you drink tap water. If you’re not a fan of straight up water in a glass, there are plenty of ways to jazz it up. From adding fruit and herbs such as mint, lemons and berries, to drinking water with plenty of ice or carbonated water, just because it’s elemental doesn’t mean it has to be boring. And you have to drink so much of the stuff, you might as well make it interesting. 

Food provides much more water to your diet than you might think. Fruits such as strawberries and melon and vegetables such as cucumber and lettuce are almost all water, and even something like a banana is three quarters water. For around every 100ml of liquid our bodies get each day, 20ml of it comes from food. 

It's All About The Electrolytes 

Struggling to work out how to rehydrate? If you're unsure about what electrolytes are - never fear. These little minerals carry an electric charge and are great in supporting hydration, increasing our energy levels, keeping your heart beating and healthy and as a result, improving your performance.

Water naturally contains electrolytes, so consuming the recommended daily water intake will have you good to go. But if you're not a fan of water, or just want to up your intake a bit and really start feeling the benefits, try adding citrus fruits such as lemons or limes to your water for some extra flavour, or maybe consuming Spinach or Nuts - more great sources of these minerals. 

Hydration And Exercise

Hydration is even more important when it comes to exercise. If you're regularly taking part in demanding physical activities, it’s very much worth considering your hydration while you’re exercising.

The Importance of Hydration

For every pound of sweat you lose, you should be drinking around a pint of fluid to rehydrate yourself. Sports drinks, which contain electrolytes and elements crucial for bodily rehydration such as potassium, salts and sugars, are very useful if you’re working at a high intensity or it’s hot weather. 

At Innermost, we know a few things about supporting your hydration. The Fit Protein is a great option for post-workout rehydration, and comes with the benefits of coconut water thanks to it containing powdered coconut water. It contains high levels of potassium, a key electrolyte lost through sweating when exercising, to help combat tiredness and rebalance energy levels. Added magnesium helps to rebalance your electrolytes and Pink Himalayan Salt contains 85 trace minerals needed by the human body, including potassium and calcium. 

What is Dehydration?

When you’re considering how best to stay hydrated, dehydration is a key concern. Feeling thirst one clear sign, but it’s possible to be dehydrated without experiencing thirst. A better indication is to keep an eye on the colour of your urine. If you’re drinking enough fluid, your pee should be pale yellow. Any other colour, and it’s time to start sipping. 

Feeling tired and dizzy are other common signs and both indicate the importance of hydration. If you are dehydrated, drinking water is your best bet, although sports drinks can also help, especially if it’s hot and you’re sweating a lot. 

Product Inspiration 

If you're struggling to up your hydration and energy, a great way to add some pep to your step is The Energy Booster. Packed with Branched Chain Amino Acids (BCAAs) and Leucine to prioritise endurance and stamina, this product is packed with nutritional benefits. Pair this with the stylish Innermost Shaker Bottle and you've got yourself a great combo... if we do say so ourselves. 

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Hair and nail support The promise of stronger nails that split and chip less, and hair that feels healthier and more resilient, is a big part of marine collagen's appeal and a common reason people add it to their diet. The honest picture here is that the science of this benefit is less established.  Hair and nails are made mostly of keratin rather than collagen, so the link is more indirect. Some small studies suggest collagen peptides may help with nail strength, although they do not claim to prove that marine collagen is a guaranteed solution for hair growth or brittle nails. Some marine collagen formulas also include biotin, which has authorised EFSA health claims for contributing to the maintenance of normal hair and normal skin. That makes it a useful supporting ingredient in beauty-focused supplements, but marine collagen should not be treated as a guaranteed solution for hair growth or nail strength. Improved joints and connective tissue If you run, lift or train regularly, joint comfort may be one of the marine collagen benefits that matters most to you. Collagen is found in cartilage, tendons, ligaments and other connective tissues, which is why it is often discussed in relation to active lifestyles and long-term mobility. The research into marine collagen for joints is less developed than the research around skin, but there are some relevant findings. In a 2018 double-blind, placebo-controlled trial, a daily supplement containing hydrolysed fish collagen, vitamins and other active ingredients was associated with improvements in joint wellbeing over 90 days. The results should be interpreted carefully because the formula contained more than marine collagen alone, but they do support the wider interest in marine collagen as part of a balanced diet, sensible training plan and consistent recovery routine. Marine collagen vs bovine collagen Marine and bovine collagen are two of the most common forms of collagen supplements that you will hear about: Marine collagen is sourced from fish, usually the skin and scales Bovine collagen comes from cattle, most often the hide. Both are commonly hydrolysed into collagen peptides, which means they have been broken down into smaller fragments that are easier for the body to digest and use. The main difference is usually the collagen profile. Marine collagen is typically rich in Type I collagen, the type most strongly associated with skin, bones and connective tissue. Bovine collagen usually contains both Type I and Type III collagen, giving it a slightly broader collagen profile. That does not make one automatically better than the other. Marine collagen may be more appealing if your focus is skin support or you prefer a fish-derived source, while bovine collagen may suit those looking for a wider mix of collagen types. In both cases, the quality of the supplement matters more than the source alone. Look for hydrolysed peptides, a clear dose, transparent sourcing and a format you can use consistently. Feature Marine collagen Bovine collagen Source Fish or other marine sources, often skin, scales or bones Cattle, usually hides or bones Common collagen types Mainly Type I collagen Type I and Type III collagen Often chosen for Skin hydration, elasticity and beauty-focused routines General collagen support, including skin and connective tissue Digestibility Usually hydrolysed into collagen peptides for easier digestion and mixing Also commonly hydrolysed into collagen peptides Taste and texture Can have a mild marine taste if not well formulated Usually more neutral, though this depends on the product Dietary considerations Not suitable for fish allergies, vegans or vegetarians Not suitable for people avoiding beef, vegans or vegetarians Main thing to check Source, collagen dose, peptide format and taste Source, collagen dose, peptide format and quality Is marine collagen worth taking?  For most people interested in skin health, marine collagen is a reasonable, low-risk supplement to try, as long as your expectations are realistic. The evidence for gradual gains in skin hydration and elasticity is reasonably solid. The case for hair, nails and joints is softer, but it's building. It also works best as one piece of a bigger picture and should be consumed alongside a protein-rich, varied diet, decent sleep, sun protection and staying hydrated. If you do give it a go, choose a hydrolysed product with a sensible dose and supporting nutrients like vitamin C, commit to a consistent 8 to 12 weeks, and judge the results for yourself. Whatever source you land on, quality and consistency are what turn a supplement from a hopeful purchase into a habit worth keeping. That is the standard we hold every formula to at Innermost: science over hype, quality ingredients and nothing you do not need. Whether you are looking at collagen, protein or everyday wellness support, the same rule applies: choose what fits your body, your goals and the routine you can actually stick to. If you're not sure where to start, our free nutritionist consultation can help you work out what actually fits your goals. Frequently asked questions  Is marine collagen better than bovine collagen?  Neither is outright better. Marine is primarily Type I and may appeal to those looking for a fish-derived source, while bovine offers Types I and III and is often cheaper. Can vegans take marine collagen?  Marine collagen comes from fish, so it isn't suitable for vegans or vegetarians. Vegan "collagen support" products work differently, supplying nutrients such as vitamin C that contribute to normal collagen formation rather than collagen itself. Does marine collagen taste fishy?  A good-quality hydrolysed marine collagen should be virtually flavourless. A noticeable fishy taste is usually a sign of a lower-quality product. How much Marine Collagen should I take? Most research points to an effective daily intake of somewhere between 2.5g and 15g of collagen peptides, with many of the skin studies sitting in the middle of that range. References Czajka, A., Kania, E., Genovese, L., Corbo, A., Merone, G., Luci, C., Sibilla, S., Siciliano, C. (2018). Daily oral supplementation with collagen peptides combined with vitamins and other bioactive compounds improves skin elasticity and has a beneficial effect on joint and general wellbeing. Nutr Res. 57. Click here. Farooq, S., Ahmad, M., Zheng, S., Ali, U., Li, Y., Shixiu, C., Zhang, H. (2024). A review on marine collagen: sources, extraction methods, colloids properties, and food applications. Collagen Leather. 6(11). Click here. Myung, S., Kim, J., Lee, Y., Choi, Y. (2025). Effects of collagen supplements on skin aging. Am J Med. Click here. Pu, S., Huang, Y., Pu, C., Kang, Y., Hoang, K., Chen, K., Chen, C. (2023). Effects of oral collagen for skin anti-aging: a systematic review and meta-analysis. Nutrients. 15(9). Click here Evans, M., Lewis, E., Zakaria, N., Pelipyagina, T., Guthrie, N. (2021). A randomized, triple-blind, placebo-controlled, parallel study to evaluate the efficacy of a freshwater marine collagen on skin wrinkles and elasticity. J Cosmet Dermatol. 20(3), 825–834. Click here. Hexsel, D., Zague, V., Schunck, M., Siega, C., Camozzato, F., Oesser, S. (2017). Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails. J Cosmet Dermatol. 16(4), 520–526. Click here. EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA). (2010). Scientific Opinion on the substantiation of health claims related to biotin. EFSA Journal. 8(10), 1728. Click here. Read more