ThornevsWonderfeel Younger (Youngr NMN)

Thorne's longevity line centers on raising NAD+ (nicotinamide adenine dinucleotide), a coenzyme essential for mitochondrial energy production and DNA repair that declines with age. ResveraCel delivers nicotinamide riboside (NR), a vitamin B3 form the body converts into NAD+, which in turn fuels "sirtuin" enzymes linked to cellular maintenance. The formula adds trans-resveratrol and quercetin phytosome (intended to support sirtuin activity and absorption) plus betaine to support methylation, since NAD+ metabolism consumes methyl groups. In plain terms: NR is the raw material that tops up your NAD+ tank; the other ingredients are meant to help that tank get used efficiently. This is a plausible mechanism, but a mechanism is not the same as a proven health outcome.

Two daily capsules supply 900 mg of nicotinamide mononucleotide (NMN), a direct NAD+ precursor that feeds the coenzyme driving mitochondrial energy and DNA repair. The formula layers in 50 mg trans-resveratrol and ergothioneine as antioxidant and sirtuin-support compounds, plus olive-fruit hydroxytyrosol and vitamin D3 as complementary healthspan ingredients.

The strongest evidence is narrow but consistent: NR reliably raises NAD+. A randomized, double-blind, placebo-controlled trial of 120 adults aged 60-80 testing an NR-plus-pterostilbene formula found whole-blood NAD+ rose roughly 40% at the recommended dose and about 90% at double dose by week 4, sustained over the 8-week trial (Dellinger et al., npj Aging, 2017). A 2025 eClinicalMedicine long-COVID trial using 2000 mg/day NR raised NAD+ about 2.6-3.1 fold, yet showed no statistically significant improvement in its primary cognition outcome or in fatigue, sleep, or mood versus placebo; exploratory analyses hinted at some symptom improvement in those who took NR for at least 10 weeks, but this was not a confirmed result. Resveratrol's longevity benefits remain unproven in humans: comprehensive reviews cite poor bioavailability and no conclusive clinical evidence for anti-aging outcomes. So: NAD+ goes up; downstream "live longer/feel younger" benefits are not yet demonstrated.

Independent randomized trials of NMN (for example, a 2023 study in healthy middle-aged adults) show that daily NMN supplementation reliably raises blood NAD+ and is generally well tolerated, with some trials reporting improvements in physical performance markers like walking distance. However, Wonderfeel's specific multi-ingredient formula has not been tested in its own published human trial, so efficacy is inferred from ingredient-level evidence rather than the finished product.

In clinical trials, NR-based formulas were well tolerated with no serious adverse events; mild, uncommon effects included gastrointestinal upset (nausea, bloating), more frequent at higher doses. Resveratrol at high doses can cause GI symptoms and, because it may mildly inhibit platelet aggregation and certain drug-metabolizing enzymes, can theoretically increase bleeding or interact with medications. Quercetin is generally well tolerated. There are no documented serious safety signals at label doses, but long-term, high-dose safety data are limited, so periodic check-ins with a clinician are sensible. This is general information, not medical advice.

NMN at these doses is generally well tolerated in human studies. Infrequent effects can include mild digestive upset, headache, or flushing. Discontinue and consult a clinician if you experience an unexpected reaction.

As of 2026, ResveraCel runs about $58-60 for a one-month supply (60 capsules at the standard 2-capsules-once-daily serving), with roughly 10% off via Thorne's subscription. Third-party retailers (Amazon, iHerb, Vitacost, and the Mayo Clinic Store) price it similarly, occasionally a few dollars less. Supplements are not covered by insurance, but US buyers can typically pay with HSA/FSA funds. Thorne's separate Biological Age test is about $95, and note that the required blood panel is an added, separate cost you arrange yourself.

As of 2026, $73/month on subscription or $88 for a one-time 30-day bottle from Wonderfeel; 3- and 6-pack bundles reduce per-bottle cost. Not covered by insurance.

Best for generally healthy adults, often 40+, who want a high-purity NAD+ precursor and value third-party certification (athletes benefit from NSF Certified for Sport options). Avoid or get medical clearance if you are pregnant or breastfeeding, have liver or kidney disease, or take blood thinners or blood-pressure medication, since resveratrol can affect clotting and drug metabolism. People on chemotherapy or with hormone-sensitive conditions should consult an oncologist before using resveratrol-containing products. It is a supplement, not a treatment for any diagnosed disease.

Aimed at healthy adults seeking NAD+ and general healthy-aging support. Not for those who are pregnant or breastfeeding; anyone with a medical condition or on prescription drugs should consult a clinician first. Educational information only, not medical advice.