The current study is designed as a randomized double-blind placebo-controlled parallel trial. It aims to investigate the efficacy of Qualia NAD+ on intracellular NAD levels in blood samples (primary outcomes) and health-related quality of life (secondary outcomes) in an adult population experiencing moderate to severe joint pain between ages of 40 and 65 years.

Inclusion criteria:

Provide voluntary, written, informed consent to participate in the study Agree to provide a valid cell phone number and are willing to receive communications through text.

Healthy male and female participants between the ages of 40-65 years of age. Willingness to complete questionnaires, records, and diaries associated with the study.

Willing to not consume any supplements, energy drinks/shots, or other products containing any form of supplemental vitamin B3 (e.g., niacin, niacinamide, nicotinamide ribosome, NMN) starting about 2 weeks prior to the baseline NAD fingerstick test and continuing through the intervention period.

Willing to not begin taking any new supplements during the study period, and to continue taking any supplements they are currently using regularly (with the exception of vitamin B3 containing supplements).

Willing to self-administer the intracellular NAD fingerstick test kit at home for both a baseline and post-intervention blood sample, and to complete a release form that gives NHC access to the results of these tests.

Exclusion criteria:

Women who are pregnant, breastfeeding, or planning to become pregnant during the trial Known food intolerances/allergy to any ingredients in the product Having any of the following conditions: Psychiatric conditions, neurologic disorders, endocrine disorders, cancer Having had a significant cardiovascular event in the past 6 months Taking MAO inhibitors, SSRIs, or any other psychiatric or neurological medicines On immunosuppressive therapy Individuals who were deemed incompatible with the test protocol Adults lacking capacity to consent