Collagen Water: Is It Magic or Just Clever Marketing? | Glasgow Dietitian Explains

Collagen drinks and “collagen water” are everywhere right now. Walk into a supermarket

or pharmacy, and you’ll likely see colourful bottles promising better skin, stronger hair, and healthier joints. My name is Sophie, and I am a registered dietitian helping clients at SPG Glasgow feel and perform at their best. In this blog, we talk about all things collagen!

Recently, I spotted a collagen water in LIDL for just 79p - lime and mint flavoured with added vitamins and caffeine (you can watch a video I took at the store at the bottom of this blog). Compared with some collagen supplements that cost £30–£50 per month, it certainly looked like a bargain. But it raises an important question:

Do collagen drinks actually work - or are they mostly marketing?

Let’s break down what collagen is, what the science says, and whether these drinks are actually worth including in your routine.

What Is Collagen?

Collagen is the most abundant protein in the body, forming a key structural component of skin, tendons, ligaments, bones, and cartilage.

As we age, our natural collagen production gradually decreases. This decline is why collagen is often linked to wrinkles, joint stiffness, and changes in skin elasticity.

Because of this, the supplement industry has created a huge market around collagen powders, capsules, and drinks.

What Happens When You Drink Collagen?

One of the biggest misconceptions about collagen drinks is that the collagen you consume goes directly to your skin or joints. Unfortunately, that’s not quite how digestion works.

When you consume collagen, your digestive system breaks it down into amino acids, just like any other protein you eat. Your body then uses those amino acids wherever they are needed - not necessarily to rebuild collagen in your skin or joints.

In other words, your body doesn’t know whether those amino acids came from collagen powder, chicken, eggs, or fish.

What Does the Research Say?

The research around collagen supplementation is mixed. Some studies show small improvements in skin hydration and elasticity when people take collagen peptides consistently for several weeks.

However, these effects tend to be modest rather than dramatic, and the improvements are often measured with specialist instruments rather than visible changes.

There are also some studies suggesting collagen may help reduce joint pain in certain populations, particularly people with osteoarthritis or athletes experiencing joint strain.

However, there are a few important caveats:

• Many studies are industry-funded

• Dosages vary widely between studies

• Results are not consistent across all research

Because of this, some experts conclude there still isn’t strong enough evidence to support many of the claims used in collagen marketing.

Do You Actually Need a Collagen Supplement?

For most people, the answer is probably not. If you’re eating a balanced diet with adequate protein, your body already has the building blocks it needs to produce collagen. Important nutrients that support natural collagen production include:

• Protein (meat, fish, eggs, dairy, legumes)

• Vitamin C (fruit and vegetables)

• Zinc and copper

• Amino acids like glycine and proline

These nutrients help your body produce collagen naturally without needing a specialised supplement.

So What Does Glasgow Dietitian say About Collagen Water?

Products like collagen water or vitamin waters are often marketed as functional health drinks. But nutritionally speaking, they’re usually just:

• Flavoured water

• Small amounts of collagen peptides

• Added vitamins or amino acids

• Very low calories

That doesn’t mean they’re bad. If you enjoy them, they can be a tasty, low-calorie drink option. The key thing to remember is that they’re best viewed as a nice extra rather than a health necessity.

When Might Collagen Supplements Be Useful?

There may be certain situations where collagen supplementation could be helpful, such as:

• People with joint issues or osteoarthritis

• Individuals with very low protein intake

• Older adults with declining collagen production

• Athletes with heavy joint loading

However, even in these cases, collagen should be considered part of a wider nutrition and lifestyle strategy, rather than a magic solution.

The Bottom Line

Collagen drinks are hugely popular. The idea of improving skin, hair, and joints with a simple drink is appealing.

But the reality is a little more nuanced. While collagen supplements may provide small benefits in some situations, they’re not the miracle solution they’re often marketed as.

For most people, focusing on:

• A balanced diet

• Adequate protein intake

• Fruit and vegetables

• Good sleep

• Regular exercise

will have a far greater impact on long-term health.

If you enjoy collagen drinks, there’s no problem including them. Just remember: they’re a nice addition to your routine, not a necessity.

Dietitian Talks Collagen Water

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