New — The Peptide Dictionary: 128 terms, explained simply
New guide — NAD+ for Anti-Aging: What the Science Says
New guide — GHK-Cu: the copper peptide for your skin
Not sure where to start? — A 60-second quiz points you to the path that fits your goal
New explainer — Semaglutide: what the research says, made simple
Browse — Peptide guides, made simple
New — The Peptide Dictionary: 128 terms, explained simply
New guide — NAD+ for Anti-Aging: What the Science Says
New guide — GHK-Cu: the copper peptide for your skin
Not sure where to start? — A 60-second quiz points you to the path that fits your goal
New explainer — Semaglutide: what the research says, made simple
Browse — Peptide guides, made simple
Skip to main content
Tools

Weight Loss

Start here: GLP-1s for weight loss →

GLP-1 medications, what they cost, and living with them.

Get startedCompare providers27 telehealth providers, scored the same way — price, what's included, and who each one suits.See the comparison →

Sexual Health

Start here: sexual wellness →

ED, low desire, and what the approved options actually are.

Get startedCompare providersSexual wellness providers scored on the same footing — price, format and what's actually included.See the comparison →

Hair Loss

Start here: hair thinning →

Why hair thins, and what has evidence behind it.

Get startedWhat actually worksSix copper peptide serums compared on formula, strength and price.See the comparison →

Hormones

Start here: hormones and aging →

Growth hormone, PCOS, and the peptides people ask about.

Get startedWhat the trials showEvery peptide we cover, with the human trials behind it — or the absence of them.Browse the evidence →

Peptides & Longevity

Start here: what are peptides? →

The molecules, the evidence, and where regulation stands.

Get startedOriginal researchOur own analysis of primary government data — full methodology and datasets published.See the research →

Medications

Start here: every molecule we cover →

One page per medicine — what it is, what it costs, what to expect.

Get startedPeptides A–ZEvery peptide we cover, in one list, with where each one stands.Browse A–Z →
Compare providers
Easy-to-follow guides
Independent reviews
Vetted providers
Free to read

Home / Products / NAD+ supplements / Doctor's Best

NAD+ supplements

Doctor's Best NMN 12000 400 mg

Doctor's Best NMN 12000 400 mg is a capsule, providing 400 mg of its NAD+ precursor per serving, across 30 servings per container. Every figure here comes from the label filed with the NIH, not from the brand.

400 mg
Key dose per serving
1
Ingredients listed
30
Servings per container
Regulatory status of NMN, checked 1 October 2026. The FDA excluded NMN from the definition of a dietary supplement in 2022, then reversed that position: in letters dated 29 September 2025 it confirmed NMN is not excluded, and on 9 December 2025 it published New Dietary Ingredient response letters for NMN suppliers. NMN is still treated as a New Dietary Ingredient, so a supplier must notify the FDA before marketing it. NMN does not appear on the FDA ingredient directory as an ingredient of concern as of its 1 May 2026 update. This is a moving area: check the current position before relying on it.

Product facts

BrandDoctor's Best
FormatCapsule
Key dose per serving400 mg
Serving size2 Veggie capsules
Servings per container30
Net contents60 Delayed Release capsules
Barcode (GTIN)0753950005778
Label claim typesAll Other, Structure/Function
Product typeNon-Nutrient/Non-Botanical
Market statusOn market
Label filed with NIH2022-06-16

See the full filed label on the NIH database, including the label image

What is in a serving

Per serving, as printed on the label filed with the NIH Dietary Supplement Label Database.

IngredientAmount% DV
Beta-Nicotinamide Mononucleotide
Nicotinamide Mononucleotide
UNII C11H15N2O8P
400 mg

Other ingredients: Rice Flour, Hypromellose, Magnesium Stearate, Silicon Dioxide, Pectin

What the label says

These are the manufacturer's own words, taken from the label filed with the NIH. They are claims made by the brand, not findings by Peptides.io, and they have not been evaluated by the FDA.

How the brand says to use it

  • Suggested Adult Use: Take 2 capsules daily.

Precautions on the label

  • Warning: Not recommended for children.
  • Consult a physician before use if you are pregnant, nursing, have a medical condition or taking any medications.
  • Keep out of reach of children.

Storage

  • Store in a cool fry place.

What the label says it contains

  • Nicotinamide Mononucleotide (NMN) is the precursor to Nicotinamide Adenine Dinucleotide (NAD+), an essential component of the cellular processes to support various metabolic functions. As we age, NAD+ levels decline in the body, decreasing the mitochondrial sirtuins which may play a role in healthy aging.
  • 400 mg per serving

Other claims printed on the label

  • Supports healthy aging, energy, and NAD+ production
  • Made in the USA
  • Supports Healthy aging and NAD+ production Stimulates energy production Metabolic functions

Other nad+ supplements

Related reading

Frequently asked questions

How much NAD+ precursor is in Doctor's Best NMN 12000 400 mg?

The label filed with the NIH Dietary Supplement Label Database lists 400 mg per serving.

Is this product FDA-approved?

No. The FDA does not approve dietary supplements. Manufacturers are responsible for the safety and labelling of their own products, and the FDA acts after a problem is reported rather than approving products in advance.

Where does the information on this page come from?

The product label filed with the NIH Dietary Supplement Label Database, a public database run by the National Institutes of Health. Nothing on this page is supplied by the brand.

Label data from the NIH Dietary Supplement Label Database, checked 2026-10-05. Peptides.io does not sell supplements and has no commercial relationship with this brand. Dietary supplements are not reviewed or approved by the FDA before sale; talk to a clinician before starting any supplement.