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What is NMN – and Why is Everyone Talking About It? | GNC

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October 29, 2025

What is NMN – and Why is Everyone Talking About It?

By Rachel Baker |
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Rachel Baker MS, RD, CSSD, LDN
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 If you’ve been hearing the buzz about NMN supplements lately, you’re not alone. NMN is short for Nicotinomide Monoucleotide. NMN is a molecule that’s gaining attention for its potential to support energy, healthy aging, and cellular repair. But what exactly is it? And should you consider adding it to your supplement routine? 

Let’s break it down. 

NMN’s Benefits and Superpowers: Boosting NAD+

NMN’s claim to fame is that is help your body make NAD+ (Nicotinamide Adenine Dinucleaotide). NAD+ is a molecule that’s absolutely essential for life. NAD+ is responsible for turning the food you eat into energy, supports healthy cells, and activates important proteins that keep your body functioning well – and at it’s best. 

Here’s what NAD+ does:

  • Powers your cells: Helps to convert carbs, fats, and proteins into usable energy. 
  • Supports cellular repair: It activates proteins that help repair DNA, supporting the body’s natural inflammatory response and oxidative stress. 
  • Keeps your metabolism humming: NAD+ helps balance breaking down nutrients and building up healthy tissues – a process called cellular metabolism. 

Why NAD+ Levels Drop with Age

Unfortunately, NAD+ levels naturally decline as we get older. According to Harvard researcher Dr. David Sinclair, NAD+ levels can drop by up to 50% by middle age. This decline is linked to slower metabolism, increased fatigue, and reduced cellular repair. 

Recent studies show that aging reduces both the production of NAD+ and increases its breakdown due to stress and inflammation. 

Can You Just Take NAD+ Without NMN?

Not quite. NAD+ itself is unstable when taken orally – it tends to break down before your body can absorb it. IV infusions are available but expensive and not well-supported by long-term research.  

That’s where NMN comes in. 

NMN: A Smarter Way to Boost NAD+

NMN is a prescursor to NAD+ meaning your body can convert it into NAD+ more easily. It’s found naturally in foods like broccoli, edamame, avocado, and salmon – but only in tiny amounts. 

Clinical studies show that taking 250mg of NMN daily can effectively raise NAD+ levels in healthy adults. 

Who Should Take NMN?

Is NMN Just for Older Adults?

Not at all. While NMN is popular among older adults looking to support healthy aging, it’s also used by younger people who want to optimize energy, recovery, and overall wellness: NAD+ levels don’t drop overnight – they decline gradually, and lifestyle stressors can accelerate that process. 

Adding NMN to your routine may help you stay ahead of the curve. 

The Bottom Line

NMN is a promising supplement that helps your body make more NAD+ – a molecule that is essential for energy, cellular repair, and healthy aging. While you can get small amounts from food, supplements offer a more practical way to support your NAD+ levels. 

If you’re curious about NMN, trust GNC and our trusted assortment of NAD+ and NMN supplements on your journey to Living Well. 

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