Independent supplement research / cited and compared
Understand what a supplement can do, where the evidence stops, and which products earn a closer look.
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Reference library
Evidence and buying guide
Vitamin D3 supports bone health by enhancing calcium absorption and promoting immune function. It is often used to address deficiency, support mood, and maintain overall wellness, especially for those with limited sun exposure.
Evidence and buying guide
Omega-3 is an essential fatty acid that supports heart health, brain function, and may help reduce inflammation. It is commonly used to promote joint health and immune support.
Evidence and buying guide
Magnesium is an essential mineral that supports muscle and nerve function, promotes relaxation, and contributes to bone health. It is commonly used to alleviate muscle cramps, support sleep quality, and help manage anxiety and stress.
From the research desk
Small, short-term trials in healthy adults report better performance on some attention-switching tasks after caffeine and L-theanine together. Results vary by task, and the evidence does not establish that the combination reliably outperforms caffeine alone. A 2025 review found possible benefits versus placebo, with uncertainty in the size and consistency of effects.
Randomized human studies consistently show that caffeine can reduce vigilance failures during acute sleep deprivation, especially on psychomotor attention tests. The benefit is incomplete, varies by task and person, and may be offset by poorer recovery sleep or cardiovascular effects.
Human research on bovine colostrum in physically active adults suggests possible effects on exercise-related gut-permeability markers, but findings are inconsistent. Immune biomarker changes are generally small, while recovery and performance evidence remains limited and dependent on narrow laboratory outcomes.
Human trials suggest lactoferrin can affect some iron-related and immune markers, but findings vary by population, formulation, comparator, and study design. Evidence is strongest for short-term laboratory changes, not for broad clinical benefits.
Human studies consistently show that trimethylglycine, also called betaine, can lower circulating homocysteine under some conditions. Evidence for better exercise performance is weaker and varies by outcome, training status, study duration, and test protocol.
Human studies of inositol suggest possible effects on panic symptoms and glucose-related measures, but the evidence is uneven. Small psychiatric trials, mixed metabolic studies, and PCOS research do not establish a consistent benefit across populations or outcomes.
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