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A small preliminary study to test feasibility before a full-scale trial.

A study examining how different supplement doses affect outcomes.

A trial where both participants and researchers know who receives the treatment.

Evaluation of research by independent experts before publication.

A study where participants are randomly assigned to treatment or control groups.

A statistical method combining results from multiple studies for stronger conclusions.

A comprehensive review that identifies and critically evaluates all relevant studies on a topic.

A study conducted in a living organism, typically animal models.

A trial where neither participants nor researchers know who receives the treatment.

A study comparing the supplement against an inert substance to isolate true effects.

A study where participants receive both the treatment and placebo in sequence.

An observational study tracking a group of people over time to assess outcomes.

A laboratory study conducted on cells or tissues outside a living organism.

An analysis including all participants as originally assigned, regardless of compliance.

A detailed description of a single patient's experience with a supplement.

A study that observes outcomes without intervening or assigning treatments.

A research study that tests a supplement or intervention in human participants.

A break between treatment periods to eliminate residual effects of the previous intervention.

A B-vitamin essential for keratin production and hair, skin, and nail health.

A fat-soluble vitamin crucial for calcium absorption, immunity, and overall health.

An essential mineral supporting immunity, wound healing, and protein synthesis.

A mineral essential for oxygen transport and red blood cell production.

A trace mineral essential for thyroid function and antioxidant defense.

A B-vitamin essential for nerve function, DNA synthesis, and red blood cell formation.

A B-vitamin essential for DNA synthesis, cell division, and tissue growth.

A trace mineral essential for thyroid hormone production.

Indigestible plant material that supports digestive health and gut microbiome diversity.

A mineral involved in 600+ enzymatic reactions, including sleep and stress regulation.

Essential fats (EPA/DHA) with anti-inflammatory properties supporting cardiovascular and brain health.

The most abundant protein in the body, supporting skin, hair, joints, and connective tissue.

A hormone regulating the sleep-wake cycle, produced by the pineal gland.

A water-soluble antioxidant essential for collagen synthesis and immune function.

A botanical extract that may inhibit 5-alpha-reductase, studied for hair loss.

An adaptogenic herb used to reduce stress and cortisol levels.

The active compound in turmeric with potent anti-inflammatory and antioxidant properties.

Live microorganisms that confer health benefits when consumed in adequate amounts.

An antioxidant compound essential for cellular energy production.

An amino acid from tea leaves that promotes relaxation without sedation.

A precursor to glutathione, the body's master antioxidant.

A fat-soluble vitamin essential for vision, immunity, and cell differentiation.

A fat-soluble antioxidant protecting cell membranes from oxidative damage.

The most abundant mineral in the body, essential for bones, muscles, and nerve function.

An essential amino acid involved in collagen formation, iron absorption, and immune function.

Small protein fragments bound to copper ions, studied for wound healing and tissue remodeling.

A carotenoid antioxidant from microalgae with potent free-radical scavenging activity.

A trace mineral involved in collagen cross-linking and connective tissue integrity.

A Pacific Island plant (Piper methysticum) containing kavalactones with anxiolytic properties.

A spice (Crocus sativus) containing crocin and safranal with antidepressant and sleep-support properties.

An amino sulfonic acid with inhibitory neurotransmitter properties, modulating GABA and glycine receptors.

The proportion of a supplement that is absorbed and available for use by the body.

The time required for the body to eliminate half of a substance's active amount.

A substance that neutralizes free radicals, protecting cells from oxidative damage.

A property or substance that reduces inflammation in the body.

An enzyme that converts testosterone to DHT, the hormone linked to pattern hair loss.

A potent androgen hormone that drives pattern hair loss by miniaturizing hair follicles.

The body's internal 24-hour clock regulating sleep-wake cycles and physiological processes.

An unstable molecule that damages cells by stealing electrons from other molecules.

An imbalance between free radical production and the body's antioxidant defenses.

The brain's primary inhibitory neurotransmitter, promoting calm and sleep.

A neurotransmitter regulating mood, sleep, appetite, and the precursor to melatonin.

The biological process of producing collagen protein in the body.

The community of trillions of microorganisms living in and on the human body.

The process by which nutrients pass from the digestive tract into the bloodstream.

The chemical processes by which the body converts nutrients into energy and building blocks.

Small signaling proteins released by immune cells to regulate inflammation and immunity.

A chemical messenger transmitting signals between nerve cells in the brain and body.

Programmed cell death — a controlled process essential for tissue homeostasis.

The body's master antioxidant, a tripeptide produced in every cell.

Temporary hair shedding caused by stress, illness, or nutritional deficiency.

The three-phase cycle (anagen, catagen, telogen) of human hair follicle growth.

The body's primary stress hormone, produced by the adrenal glands.

A selective barrier of endothelial cells that controls which substances enter the brain from blood.

A glutamate receptor involved in synaptic plasticity, memory, and neural excitability.

The class of psychoactive compounds in kava responsible for anxiolytic and sedative effects.

Plant-derived compounds that can bind estrogen receptors and modulate hormonal activity.

A metabolic pathway that converts toxic ammonia into urea for excretion by the kidneys.

A class of herbs and compounds that may help the body resist and adapt to physical and mental stress.

The most common form of hair loss, driven by genetics and DHT hormone.

Persistent difficulty falling asleep, staying asleep, or waking too early.

The immune system's response to injury or infection, which can become chronic and harmful.

An inadequate level of a vitamin or mineral needed for normal body function.

Underactive thyroid gland producing insufficient thyroid hormones.

A condition where the blood lacks enough healthy red blood cells or hemoglobin.

An autoimmune condition causing patchy hair loss when the immune system attacks hair follicles.

A disorder where breathing repeatedly stops and starts during sleep.

Persistent excessive worry or fear that interferes with daily activities.

Persistent tiredness or exhaustion not relieved by rest.

Inflammation of the skin causing itching, redness, and irritation.

Cellular harm caused by excess free radicals overwhelming antioxidant defenses.

The condition of the scalp skin and follicular environment affecting hair growth.

Misalignment between the body's internal clock and external environment.

An irresistible urge to move the legs, especially at rest and in the evening.

Discomfort, aching, or soreness in any joint of the body.

Gradual loss of memory, attention, and thinking ability with aging.

A cluster of conditions increasing risk of heart disease, stroke, and diabetes.

An imbalance in the gut microbial community linked to inflammation and disease.

The body's physiological and psychological response to perceived threats or demands.

A state of elevated physiological and cognitive activation that interferes with sleep onset.

Hot flashes and night sweats caused by hormonal changes, particularly during menopause.

Rapid hair loss during the active growth phase, typically caused by chemotherapy or toxins.

The probability of observing results as extreme as the data, assuming no true effect.

A range of values likely to contain the true effect size, typically at 95% confidence.

A scatter plot used to detect publication bias in meta-analyses.

A measure of the magnitude of a treatment's impact, independent of sample size.

A result unlikely to have occurred by chance, typically at p < 0.05.

The number of participants enrolled in a study.

The ratio of event probability in the treatment group vs. the control group.

The ratio of odds of an event in the treatment group vs. the control group.

How many people need to take a supplement for one additional person to benefit.

A graphical display showing individual study results and the pooled meta-analysis estimate.

The degree of variation in study results across a meta-analysis.

The tendency for studies with positive results to be published more often than negative ones.

A measure of the percentage of variability across studies due to true differences.

A measure comparing the rate of an event occurring between two groups over time.

A measure of how spread out data values are from the average.

A measurable indicator of a biological state, used to assess health and treatment response.

Improvement in symptoms due to the belief of receiving treatment, not the treatment itself.

A consistent error in study design that skews results in one direction.

A claim describing how a supplement affects the body's structure or function, not disease.

A claim that a product treats, cures, or prevents a disease — prohibited for supplements.

The 1994 US law regulating dietary supplements as a special food category.

Manufacturing standards ensuring supplement quality, purity, and consistency.

Independent laboratory verification of a supplement's contents, purity, and potency.

A certification indicating a supplement meets rigorous quality standards set by the US Pharmacopeia.

A certification indicating a supplement has been tested for safety and label accuracy.

A participant's voluntary agreement to join a study after understanding its risks and procedures.

The system for reporting serious side effects from supplements to the FDA.

The US agency responsible for regulating food, drugs, and dietary supplements.

A document verifying a supplement batch's tested potency, purity, and contaminant levels.

The maximum daily nutrient intake unlikely to cause adverse health effects.

Liver damage caused by drugs, supplements, or other chemicals.

When a dietary supplement alters the effectiveness or safety of a prescription medication.