The standard recommended dose of Tru Niagen is 300 mg once daily, taken by mouth with or without food. That single-capsule routine is straightforward, but timing, what to expect, and a few practical details can make a real difference in how well it works for you.
Daily Dose and How to Start
Most adults take one 300 mg capsule per day. An eight-week clinical trial tested doses of 100 mg, 300 mg, and 1,000 mg daily and found all three to be safe and well tolerated, but 300 mg is the dose ChromaDex (the company behind Tru Niagen) settled on as the recommended amount. Some people start at a lower dose, around 100 mg, for the first week or two before moving to 300 mg, though this isn’t strictly necessary for most people.
Doses up to 1,000 mg per day have been used safely in research settings. There is no strong evidence that going above 300 mg produces meaningfully better results for general wellness, so doubling up without a specific reason is unlikely to help.
Best Time of Day to Take It
Morning is the best window. Tru Niagen raises levels of NAD+, a molecule your cells use to produce energy. That energy boost aligns well with your body’s natural daytime rhythm but can interfere with sleep if you take it too late. Clinical practitioners who work with NAD+ precursors consistently recommend finishing your dose before early afternoon, ideally between 8:00 AM and 2:00 PM.
If you’re sensitive to stimulants like caffeine, aim for a morning dose before 11:00 AM. Taking it in the evening doesn’t pose a safety risk, but a significant number of people report disrupted sleep or a restless, alert feeling at night when they take NAD+ boosters later in the day. The simplest approach: take your capsule with breakfast and don’t think about it again.
With or Without Food
Tru Niagen can be taken on an empty stomach or with a meal. There’s no clinical evidence that food significantly changes absorption. That said, some people notice mild nausea or stomach discomfort when taking it without food. If that happens to you, pairing it with breakfast or a snack usually solves the problem.
How Long Before You Notice Results
NAD+ levels don’t spike overnight. In a randomized controlled trial published in The Lancet, participants taking nicotinamide riboside (the active ingredient in Tru Niagen) saw their NAD+ levels rise 2.6-fold after five weeks and up to 3.1-fold after ten weeks. Those elevated levels held steady at the 20-week mark as long as supplementation continued.
This means you should give it at least four to six weeks before evaluating whether it’s doing anything for you. Some people report feeling more energy or mental clarity within the first two weeks, but the full cellular effect takes longer to build. If you stop taking it, NAD+ levels gradually return to baseline.
Side Effects to Watch For
Tru Niagen is well tolerated in clinical trials, with side effect rates similar to placebo at the 300 mg dose. The most commonly reported issues are mild and digestive: occasional nausea, bloating, or loose stools, particularly in the first few days. These typically resolve on their own.
Nicotinamide riboside can lower blood pressure slightly. If you already take blood pressure medication, that combined effect could push your readings too low. Keep an eye on your numbers, especially in the first few weeks.
People with liver disease, active peptic ulcers, gout (high uric acid), poorly controlled blood sugar, or unstable angina should be cautious, as nicotinamide compounds can potentially worsen these conditions. For pregnancy and breastfeeding, research supports safety only up to 230 mg daily, which is below the standard 300 mg capsule.
Storing Your Capsules
Keep the bottle in a cool, dry place. A kitchen cabinet away from the stove works fine. You don’t need to refrigerate it. The capsules are engineered to stay stable even in temperatures up to 130°F (54°C) during short periods like shipping, so a few warm days won’t ruin them. Just avoid leaving the bottle in direct sunlight or in a hot car for extended stretches.
Quick Reference
- Dose: 300 mg, once daily
- Timing: Morning, ideally before 2:00 PM
- Food: Optional, but can reduce stomach discomfort
- Timeline: NAD+ levels peak around 5 to 10 weeks
- Storage: Cool, dry place at room temperature