Diane Marsh

How I work

The weight and metabolism corner of the supplement market is the loudest one there is, and most of the noise is aimed at people who are tired and want it to be simple. I try to write the opposite of that: answer the question in the first paragraph, name the study rather than gesturing at "research shows", and be straight about the difference between what an ingredient did in a trial and what a capsule containing some of that ingredient can reasonably do.

That last part matters more here than anywhere else. A lot of these formulas are built on ingredients with genuine human data, taken at amounts nobody publishes. So when I look at a label, the question I am asking is always the same one: how does the amount in here compare with the amount they used in the study, and can I even tell?

I also write about the unglamorous half, the sleep, the walking, the protein, the timing, because it is the half that decides whether anything else you take is doing something or just being expensive.

Where to start

Here is where my guides begin. Each one answers its title question in the first paragraph and links through to the reviews, where a specific formula gets compared line by line with the doses used in the trials.

• Why does metabolism slow down after 40, and what actually helps? The pillar guide. The measured data says the engine does not slow at 40, so this walks through what did change and the five numbers worth writing down today.
• Which metabolism support ingredients have real clinical evidence? Berberine, green tea, cinnamon, chromium and zinc, sorted into three tiers of evidence, with the trial numbers and what a proprietary blend does not tell you.
• How long do metabolism support supplements take to work? The trials ran twelve weeks. Why nothing seems to happen at first, what changes and in what order, and how a 30-day refund window fits a twelve-week plan.
• Weight loss and metabolism reviews Every metabolism formula we have taken apart, with the score for each one and how it was reached.
• MedicGLP review: the berberine blend, the evidence, and whether it is worth it Nine plant actives led by berberine, one of the few ingredients in this category with randomised trial data behind it.
• Corevalin review: the daily alignment blend, the evidence, and whether it is worth it Built on chromium and zinc, the two ingredients here that carry authorised health claims, plus a botanical support blend.