Guides

Longevity & NAD+ Guides (2026) | Vitality Supplements UK
Vitality Supplements ·

Ingredient guides & research.

In-depth guides on longevity supplement ingredients — the science, the published research and what to look for when buying. Written by a UK manufacturer that independently tests every batch.

16 guides published · Updated · Written by Vitality Supplements Editorial Team
Buying Guide

Best longevity supplements UK

How to build an evidence-led longevity stack — the categories that matter and the top pick in each.

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Buying Guide

Best berberine UK

How to choose a berberine supplement — form, bioavailability, dose, testing and value.

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Buying Guide

Best AHCC UK

How to choose an AHCC supplement — standardisation, research-aligned dose and testing.

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Metabolic Guide

Natural alternatives to Ozempic?

Why no supplement equals a GLP-1 medication, and the genuine natural levers — honestly.

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Science Guide

The hallmarks of ageing

The scientific framework behind why we age, explained clearly, and where ingredients fit.

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Reference

Longevity glossary

40+ longevity and supplement terms defined clearly — NAD+, sirtuins, autophagy and more.

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About

Editorial standards & team

How we research, write, review and update our guides.

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About

Quality, testing & sourcing

UK manufacturing, independent ISO/IEC 17025 batch testing and a COA on request.

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Science Guide

How to increase NAD+ naturally

Diet, exercise, fasting and the lifestyle levers that support your body’s own NAD+ levels.

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Safety Guide

NMN side effects & safety

Is NMN safe? What the research says about tolerability, dosing and who should take care.

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Protocol Guide

When to take NMN

Morning vs evening, with or without food — how to time NMN for best results.

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Ingredient Guide

What is berberine?

The plant alkaloid behind “nature’s Ozempic” — how it works via AMPK and what it’s studied for.

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Comparison Guide

Dihydroberberine vs berberine

Which form absorbs better, and which is right for you. A clear, honest comparison.

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Ingredient Guide

Berberine benefits

What the research actually supports for metabolism, blood sugar and more.

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Protocol Guide

Berberine dosage

How much berberine to take, when, and how to split doses for tolerability.

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Ingredient Guide

AHCC benefits

The mushroom-derived compound studied for immune support — what the evidence shows.

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Protocol Guide

AHCC dosage

How much AHCC to take and how to use it effectively.

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Metabolic Guide

Natural GLP-1 supplements

How GLP-1 works and the diet and ingredient levers that support your own response.

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Metabolic Guide

Berberine & GLP-1

Is berberine really “nature’s Ozempic”? An honest comparison.

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Science Guide

What is NAD+?

The coenzyme behind every longevity ingredient. What it is, why it declines with age, sirtuins and the precursor approach explained.

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Ingredient Guide

What is NMN?

Nicotinamide Mononucleotide explained — what it is, how it relates to NAD+, the published research and dosing protocols.

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Comparison Guide

NMN vs NMNH

What is the difference between NMN and NMNH? Structure, research base, dosing and how to choose between them.

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Comparison Guide

NMN vs NR

NMN and NR are both NAD+ precursors — but they are structurally distinct. Here is what the research shows and how to choose.

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Combination Guide

NMN & Resveratrol

Should you take NMN and resveratrol together? Trans-resveratrol vs resveratrol, the sirtuin research rationale and what to look for.

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Dosage Guide

NMN Dosage

How much NMN should you take? Published human clinical research doses from 250mg to 900mg per day — explained.

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Structured Guide Series

The Vitality Longevity Protocol

A five-pillar guide to longevity supplementation — covering the biology, the research and how to build a structured supplement approach.

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>99% β-NMN purity · ISO/IEC 17025 tested every batch · CoA on request · UK manufactured
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All guides are written for informational purposes by Vitality Supplements, a UK longevity supplement manufacturer. Products are food supplements regulated under UK food supplement legislation — not medicines. Not intended to diagnose, treat, cure or prevent any disease. Consult a qualified healthcare professional before use.

All guides · FAQ · Science & Testing · Research References · Contact: info@vitality-supplements.co.uk · 12 Deer Park Road, London SW19 3TL