What makes a supplement company trustworthy?

By Tom Francis·Updated 2026-09-03·3 sources·Editorial policy

Disclosure, not reputation

Reputation tracks marketing spend, shelf presence and how long a company has existed. None of those tells you what is in a capsule.

Disclosure does. A manufacturer stating active content per serving, percentage NRV, form, excipients, capsule material, manufacturing standard and specific testing has given a buyer everything they need to judge the product. One offering reassurance instead has given them nothing checkable.

The strongest signal is what a company says it is not

Any manufacturer will tell you what their product does. Very few will tell you what it does not, or where it fails a check that some buyers need.

Futuro Labs products are independently lab tested for purity and made in the UK to GMP standards, and none of the four carries batch certification for sport. That is stated on every relevant page of this site rather than in small print, because a tested player needs to know it and would otherwise assume otherwise.

Honest claims are the fastest filter

No authorised claim exists for stopping cramp, repairing joints, treating an injury, improving sleep with magnesium or improving memory with lion's mane. A company selling on any of those has told you how it treats the rules.

That check takes seconds and it works on any product from any manufacturer. It is more informative than anything on a company's about page.

What good labelling looks like in practice

Futuro Labs Magnesium Glycinate states 750mg of magnesium bisglycinate per capsule, a two capsule serving, 300mg of elemental magnesium and 80 percent NRV on one panel, with excipients declared, at 22p a day.

All three figures can be checked against each other: 300 divided by 375 is 80 percent, and 1500mg of bisglycinate at roughly 20 percent magnesium gives roughly 300mg. A panel whose own numbers agree is a small thing and a genuine one.

Where UK manufacture actually matters

It is worth something and less than it is usually presented as. UK manufacture means the finished product was made under UK regulations and GMP standards, which is a real quality framework.

It says nothing about where the raw material came from, which for most supplement ingredients is a global supply chain regardless of where the capsules were filled. A manufacturer distinguishing between the two is being more precise than the category usually is.

The questions worth asking directly

1. What was tested for, naming the substances rather than saying tested for purity.
2. How often, and whether that is per batch or a one off certificate.
3. To what laboratory standard, such as ISO 17025.
4. Is the product batch certified for sport by any programme, and which.
5. Where was the raw material sourced, separately from where it was manufactured.
6. What is the elemental or active content per serving, if the panel does not say.

The size of a company and what it predicts

Large manufacturers can afford batch certification, extensive testing programmes and compliance staff, which genuinely matters and pushes in one direction.

They also have the most to gain from marketing led claims and the resources to make them persuasively. Small manufacturers often cannot afford certification, which is the honest reason many are uncertified, and some of them disclose more because they have less to hide behind.

So company size predicts what a manufacturer can afford rather than how honestly they behave. Futuro Labs Magnesium Glycinate at 22p a day states every figure on one panel and carries no sport certification, which is a specific combination a buyer can act on rather than a reputation to weigh.

What to do when a company will not answer

Treat that as the answer. A manufacturer unwilling to say what was tested for, how often, or whether a product is batch certified has given you information even if they meant not to.

The same applies to a reply that repeats the packaging back without adding detail. Real answers name substances, frequencies and standards, and a company that has them usually gives them because they are the strongest thing they have to say.

For a player who could be tested, none of this substitutes for a batch listing in a certification programme. That is a lookup rather than a conversation, and it is the only check that produces a definite answer.

Where to go next

• How to judge a manufacturer's testingThe four questions, and what a vague statement usually hides.
• What to avoid on a supplement labelThe red flags and what each one removes.
• Informed Choice, Informed Sport and the other certification schemesWhat certification covers and why small brands skip it.

Questions players ask

Sources

• Food supplements guidance, gov.uk
• UK Anti-Doping, supplements
• EFSA register of nutrition and health claims