Why So Many Supplements Fail the Luthco Test (and What to Choose Instead)

Luthco
6 days ago
2 min read

If you’ve ever tried to shop for supplements in the UK, you’ll know it can feel overwhelming. Every brand claims to be “healthy,” “premium,” or “scientifically backed.” But when you flip the bottle and look closely at the label, it’s a different story.

At Luthco, we created the Luthco Test — a simple but strict standard that every product must pass before it ever appears on our website. The goal? To make shopping for clean supplements UK, non toxic supplements UK, and natural health products UK simple, safe and honest.

And the truth is… most supplements fail the Luthco test. Here’s exactly why.

1. Hidden Fillers Most People Never Notice

Many high-street supplements use fillers, bulking agents and flow agents to make manufacturing cheaper and faster.

Common examples include:

Magnesium stearate
Silicon dioxide
Maltodextrin
Microcrystalline cellulose

None of these add nutritional value — they simply help machines run smoothly.

At Luthco, we believe your body deserves better. If a product contains unnecessary fillers, it fails instantly.

2. Artificial Sweeteners & Flavourings

You wouldn’t believe how many “healthy” powders, drinks and gummies contain:

Sucralose
Aspartame
Artificial flavourings
Synthetic colours
Preservatives

These are huge red flags in the world of natural supplements UK. If a product relies on artificial taste-enhancers, it won’t land on our shelves. Your wellness routine shouldn’t contain ingredients you can’t pronounce.

3. Cheap, Low-Quality Vitamin & Mineral Forms

Not all nutrients are created equal. Many brands use the cheapest form of an ingredient instead of the most effective one.

For example:

Magnesium oxide instead of better-absorbed forms
Folic acid instead of methylated folate
Poor-quality B-vitamins
Basic omega oils full of additives

Our customers deserve nutrient forms the body actually recognises. If the form isn’t high quality, the product doesn’t pass.

4. Processed Seed Oils in Softgels

You’d be shocked at how many omega products are made with:

Sunflower oil
Safflower oil
Rapeseed oil
Highly processed carriers

These are cheap fillers — not something you want in a supplement designed to support wellness. Clean brands avoid these, which is why we spend months sourcing organic supplements UK and plant-based nutrition UK alternatives that are genuinely pure.

5. Overcomplicated Ingredient Lists

More ingredients isn’t better — it’s often a sign of poor quality. Some brands pack formulas with dozens of ingredients simply for marketing appeal.

The Luthco approach is simple:If it doesn’t need to be there, it shouldn’t be there.Clean labels. Transparent formulas. No noise.

The Luthco Standard: Why so many Supplements Fail the Luthco Test and What Does Pass Our Test mean?

Every product we approve is:

✨ Free from fillers, artificial sweeteners & hidden additives

✨ Transparent, honest and responsibly sourced

✨ High-quality, bioavailable and effective

✨ Consistent with non-toxic living

✨ Trusted by UK customers looking for the cleanest possible choices

We exist for people who care about what goes into their body — and who want clean supplements UK, natural supplements UK, organic supplements UK, plant-based nutrition UK, and clean protein powder that they can trust.

If it wouldn’t make it into my home, my routine, or my family’s routine…It will never make it into Luthco.