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Vitamins & vitamin-like compounds

Vitamin B3 (Niacin)

Vitamin B3 (Niacin) (water-soluble vitamin / niacin family)

Vitamin B3 is the niacin family, principally nicotinic acid and nicotinamide; for a useful product comparison, never compare B3 products by milligrams alone without identifying the exact niacin form.

Water SolubleClinical ResearchForm Dependent EvidenceLow Risk Profile
Updated August 2026/4 min read/1 citations
Reviewed by the NootropicsIndex editorial team.Method: prioritize cited human research and official safety or regulatory sources; compare retailer-listed prices without endorsing products.Affiliate disclosure
Supplement group

Vitamin B3 (Niacin) belongs to the Vitamin B group

View all Vitamin B productsVitamin B12 (Cobalamin)Vitamin B1 (Thiamin)Vitamin B2 (Riboflavin)Vitamin B5 (Pantothenic Acid)Vitamin B6Vitamin B7 (Biotin)Vitamin B9 (Folate)
01

What is it?

Identity and form

1

Vitamin B3 is the niacin family, principally nicotinic acid and nicotinamide.

02

Names, aliases and forms

AbbreviationB3
Common NameNiacin
03

Mechanisms of action

Biological role

1

Niacin vitamers supply precursors for NAD and NADP metabolism.

04

Potential effects and evidence map

Evidence is strong for the essential nutrient role of niacin, but supplementation beyond adequacy has not been shown to produce a reliable general nootropic effect in well-nourished adults. Form-specific clinical uses should be evaluated separately.

Effect domainMagnitudeGrade
Mental energy / wakefulness1
UnknownConfidence: Medium

Evidence does not establish a reliable mental-energy effect from extra Vitamin B3 (Niacin) in well-nourished healthy adults.

Note Essential nutrient biology and correction of inadequate status are different from enhancement.

1/5
C
Memory / learning1
UnknownConfidence: Medium

Direct evidence does not establish a general memory or learning benefit from Vitamin B3 (Niacin) for healthy adults.

Note Keep form- and population-specific clinical research separate.

0/5
C
05

Typical dosages and timing

Nutrition benchmark114-16 mg NE/day

Use this to interpret labels and total intake, not as a demonstrated nootropic dose or recommended cycle.

06

Timing & effect horizon

Effect horizonUnknown
Unknown
What timing evidence can show1

No reliable acute nootropic onset, duration, The time for blood levels to fall by half during the final elimination phase.Source claim, or routine cycle is established for Vitamin B3 (Niacin). Nutrient-status correction and clinical follow-up periods answer different questions.

07

Safety, side effects and risk profile

Evidence uncertainty1
Confidence: High

Marketing claims extend beyond the established nutrient or precursor evidence.

Note Separate adequacy, biochemical activity, and enhancement outcomes.

1/5
B
Interaction risk1
Confidence: Medium

Medication, laboratory, and total-intake context can change the practical risk.

Note Check the official source for ingredient-specific interaction details.

1/5
B
GI discomfort1
Confidence: Medium

Tolerability varies with the specific form and amount consumed.

Note This row summarizes ordinary tolerability rather than special-population hazards.

1/5
B
Dose- and form-specific safety1

The U.S. adult upper limit for supplemental niacin is 35 mg/day because nicotinic acid can cause flushing; pharmacologic doses can also affect the liver, glucose control, and other systems.

08

Interactions and cautions

Medication and test context1

High-dose niacin can interact with antidiabetes medicines and requires form-specific medication review.

09

Practical buying and quality notes

  • Never compare B3 products by milligrams alone without identifying the exact niacin form.1
10

FAQ

What distinguishes Vitamin B3 (Niacin) from related forms?

1

Nicotinic acid can cause flushing and has pharmacologic lipid effects; niacinamide does not share that profile, and NAD precursors require their own evidence.

11

References

  1. NIH Office of Dietary Supplements. Niacin Fact Sheet for Health Professionals.
Note

This page is informational and summarizes available evidence. It is not medical advice, a recommendation, or a substitute for guidance from a qualified clinician.