정성웅 내과 전문의 curates evidence-based supplement guides. Every page shows an evidence grade and last-reviewed date.
Find supplements that fit you — verified by evidence
From ingredients to how they work · Korea and the US together
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Well-supported first 🟢 Strong
Strongest evidence (mostly deficiency correction) shown first.
Vitamin D Vitamin D
A fat-soluble vitamin central to bone and immune health; deficiency is common in people who stay indoors.
🟢 Strong
Foundational·Immune
Vitamin C Vitamin C
An essential water-soluble vitamin for antioxidant defense, collagen synthesis, and iron uptake.
🟢 Strong
Foundational
Zinc Zinc
A trace mineral essential for immunity, wound healing, and enzyme function.
🟢 Strong
Immune
Iron Iron
Essential for oxygen transport in red cells; especially important for menstruating and pregnant women.
🟢 Strong
Blood
Folate Folate
Essential for cell division and blood formation; key for preventing neural-tube defects around pregnancy.
🟢 Strong
Women
Vitamin B12 Vitamin B12
Essential for blood and nerve function; deficiency common in vegans, elderly, and after GI surgery.
🟢 Strong
Energy·Cell
Calcium Calcium
The key mineral for bones and teeth; especially important for postmenopausal women.
🟢 Strong
Bone·Joint
B-complex B-complex
A group of water-soluble coenzymes for energy metabolism, nerves, and blood.
🟢 Strong
Energy·Cell
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Moderate evidence 🟡 Moderate
Omega-3 Omega-3
Essential fatty acids that lower triglycerides and support anti-inflammation, brain, and retina.
🟡 Moderate
Heart·Metabolic
Magnesium Magnesium
An essential mineral for muscle, nerve, and sleep; forms differ in absorption and use.
🟡 Moderate
Muscle·Nerve
Probiotics Probiotics
Live microbes for gut balance, bowel habits, and immunity; effects are strain-specific.
🟡 Moderate
Gut
Lutein·Zeaxanthin Lutein·Zeaxanthin
Carotenoids that accumulate in the macula and filter blue light for eye health.
🟡 Moderate
Eye
Coenzyme Q10 Coenzyme Q10
A fat-soluble compound involved in cellular energy production and antioxidant defense.
🟡 Moderate
Energy·Cell
Curcumin Curcumin
A turmeric polyphenol with anti-inflammatory/antioxidant activity; bioavailability is the challenge.
🟡 Moderate
Anti-inflammatory
Collagen Collagen
Hydrolyzed collagen peptides studied for skin elasticity/hydration and joints.
🟡 Moderate
Skin·Beauty
Melatonin Melatonin
A hormone that regulates the sleep–wake rhythm; evidence for jet lag and sleep onset.
🟡 Moderate
Sleep
Ashwagandha Ashwagandha
An adaptogenic herb studied for stress and sleep.
🟡 Moderate
Stress
From the blog
GuideWhat "evidence grades" mean — how to read 🟢🟡🟠The same supplement can have different evidence for correcting a deficiency vs general prevention. Here is how to read the grades.Korea vs USAKorea vs USA supplements — regulation, seals, labelingFrom the MFDS mark vs USP/NSF, IU vs mcg, to whether melatonin needs a prescription — the key differences.SafetyOn blood thinners? Supplements to be careful withOn warfarin or other anticoagulants, watch for interactions with omega-3, vitamin K, ginkgo, curcumin, and more.
Disclaimer — This content is for general information and suggestion only and does not replace medical diagnosis or treatment. Consult a doctor or pharmacist if you have a condition or take medication.