Evidence-Based Research Articles
32 in-depth articles written by registered dietitians and board-certified dermatologists, reviewed by our medical team, and backed by peer-reviewed studies from PubMed.
FeaturedNutrition7 minDoes Drinking More Water Improve Your Nails?
Nails contain 18% water, and dehydration does affect them. But the relationship between water intake and nail health is more nuanced than "just drink more." Here's what actually matters.
Elena Vasquez, IAT, CNS
Supplements8 minWhen to Take Your Supplements: The Complete Timing Guide
Iron in the morning, calcium in the evening, never together — supplement timing affects absorption by up to 300%. Get the evidence-based daily schedule for maximum benefit.
Dr. James Whitfield, PharmD, BCPS
Nutrition8 minThe Mediterranean Diet for Hair Growth: What the Research Shows
The Mediterranean diet is anti-inflammatory, nutrient-dense, and may protect against hair loss. Learn the hair-specific benefits, key foods, and how to build a hair-friendly meal plan.
Elena Vasquez, IAT, CNS
Conditions8 minAging and Hair Thinning: What's Normal and When to Act
Hair thinning affects 50% of women by age 50. Learn what's normal aging vs. treatable hair loss, which nutrients become more important with age, and evidence-based interventions.
Elena Vasquez, IAT, CNS
Supplements9 minMen's Hair Supplements: What Actually Works for Thinning Hair
Most men's hair supplements won't reverse pattern baldness. Learn what the evidence supports, how supplements compare to FDA-approved treatments, and the honest strategy for men.
Elena Vasquez, IAT, CNS
Conditions10 minThe Ultimate Nail Health Checklist: 15 Signs to Watch
From white spots to dark streaks, your nails reveal a lot about your health. Use this 15-point checklist to identify what your nail changes mean and when to see a doctor.
Dr. Priya Sharma, MD, FAAD
Supplements8 minVitamin Interactions: What Not to Take Together
Iron + calcium cancel each other out. Vitamin C boosts iron absorption. Know which supplements to combine, which to separate, and the timing that matters.
Dr. James Whitfield, PharmD, BCPS
Nutrition8 minSupplements vs. Food: Do You Really Need a Pill?
Food delivers nutrients more efficiently than most supplements. Learn when diet is enough, when supplementation makes sense, and the evidence-based approach to both.
Dr. Amanda Foster, MD, FACOG
Nutrition9 minThe Best Diet for Stronger Nails: Foods That Actually Help
Your nails need protein, iron, zinc, biotin, and more — and food delivers these nutrients more efficiently than most supplements. Here's what to eat for stronger nails.
Rachel Kim, MS, RDN, LDN
Conditions8 minHow Stress Affects Your Nails and Hair — And What to Do
Chronic stress triggers cortisol cascades that directly damage nail matrix and hair follicles. Learn the signs, recovery timeline, and evidence-based strategies to protect your nails.
Dr. Priya Sharma, MD, FAAD
Conditions7 minSeasonal Hair Loss: Why It Happens and How to Manage It
Hair shedding peaks in fall for many people. Learn why seasonal hair loss happens, how to tell it apart from real hair loss, and what (if anything) you should do about it.
Elena Vasquez, IAT, CNS
Nutrition8 minProbiotics and Hair Health: The Gut-Hair Connection
Emerging research links your gut microbiome to hair growth and hair loss. Explore the gut-skin-hair axis, which probiotic strains show promise, and whether supplements are worth trying.
Dr. Amanda Foster, MD, FACOG
Supplements9 minCollagen Types Explained: Which Type Is Best for Hair and Nails?
Types I, II, III, V, X — do you need all five? Learn which collagen types actually matter for hair and nail health, bovine vs marine, and how to choose the right supplement.
Elena Vasquez, IAT, CNS
Conditions8 minPost-Acrylic Nail Recovery: How to Repair Damaged Nails
Thin, peeling nails after removing acrylics or gels? Follow this phase-by-phase recovery plan with timeline, supplements, and care tips to restore your natural nails.
Elena Vasquez, IAT, CNS
Conditions10 minDiabetic Nail Care: A Complete Guide to Protecting Your Nails
Diabetes increases nail fungus risk by 2-3x and can lead to foot ulcers. Learn the daily care routine, treatment options, and warning signs every diabetic patient should know.
Dr. Priya Sharma, MD, FAAD
Supplements9 min10 Hair & Nail Supplement Myths Debunked by Science
From "biotin makes everyone's hair grow" to "expensive supplements work better" — we debunk the 10 most common supplement myths with evidence from peer-reviewed research.
Dr. Marcus Chen, MD, ABOIM
Treatments9 minNail Fungus Home Remedies: What Works, What Doesn't
Tea tree oil, vinegar, Vicks VapoRub — we review the clinical evidence for popular home remedies for nail fungus and explain when you need prescription treatment instead.
Dr. Priya Sharma, MD, FAAD
Supplements8 minBiotin Dosage Guide: How Much to Take for Hair and Nails
Biotin supplements range from 30 to 10,000 mcg. Learn the evidence-based dose for brittle nails, why megadoses aren't better, and critical safety warnings about lab test interference.
Rachel Kim, MS, RDN, LDN
Nutrition8 minVitamin D and Nail Health: What Low Levels Do to Your Nails
42% of US adults are vitamin D insufficient. Learn how deficiency affects your nails and hair follicles, optimal levels to target, and the right supplementation strategy.
Rachel Kim, MS, RDN, LDN
Nutrition8 minZinc for Hair Growth: How Much You Need and Why It Matters
Zinc deficiency is found in 44% of alopecia areata patients. Learn how zinc affects hair follicles, the right dose, best supplement forms, and when testing makes sense.
Rachel Kim, MS, RDN, LDN
Treatments12 minThe Complete Guide to Nail Fungus Treatment: From OTC to Prescription
Every evidence-based treatment for nail fungus compared: OTC topicals, prescription medications, laser therapy, and combination approaches — with cure rates, costs, and recommendations.
Dr. Priya Sharma, MD, FAAD
Nutrition10 minIron Deficiency and Nail Health: The Connection You Might Be Missing
Iron deficiency is the #1 nutritional cause of nail changes — from brittleness to spoon-shaped nails. Learn the signs, the ferritin levels that matter, and how to fix it.
Rachel Kim, MS, RDN, LDN
Supplements9 minKeratin Supplements vs Keratin Treatments: What's the Difference?
Salon keratin treatments and oral keratin supplements share a name but work completely differently. Compare the evidence, costs, safety, and results of each approach.
Elena Vasquez, IAT, CNS
Supplements8 minCollagen for Nails: Does It Actually Work? What the Research Says
A 2017 clinical trial showed collagen peptides reduced nail breakage by 42%. But how strong is the evidence really? We break down the research, dosing, types, and how collagen compares to biotin.
Rachel Kim, MS, RDN, LDN
Supplements9 minPregnancy-Safe Nail & Hair Supplements: What's Approved, What to Avoid
Not all hair and nail supplements are safe during pregnancy. This trimester-by-trimester guide covers what's safe, what needs caution, and what to avoid entirely while pregnant or breastfeeding.
Dr. Amanda Foster, MD, FACOG
Conditions10 minToenail Fungus Stages: What Each Stage Looks Like and What to Do
Nail fungus progresses through distinct stages from mild discoloration to total nail destruction. Learn to identify each stage, understand treatment options, and know when to see a doctor.
Dr. Priya Sharma, MD, FAAD
Supplements9 minBest Hair Skin and Nail Vitamins: Evidence-Based Rankings 2026
We rank the most important vitamins and minerals for hair, skin, and nail health based on clinical evidence — not marketing claims. Learn what works, what doesn't, and how to choose wisely.
Rachel Kim, MS, RDN, LDN
Supplements9 minBeyond Biotin: 5 Evidence-Based Alternatives for Nail & Hair Health
Biotin gets all the attention, but other nutrients have stronger clinical evidence for hair and nail health. Explore collagen, iron, zinc, vitamin D, and omega-3s — with dosages and study data.
Rachel Kim, MS, RDN, LDN
Treatments8 minWhy Your Topical Nail Fungus Treatment Stopped Working
Topical antifungals have cure rates under 20% for nail fungus. Understand why they fail, when oral medications are necessary, and how combination therapy dramatically improves outcomes.
Dr. Priya Sharma, MD, FAAD
Conditions9 minPostpartum Hair Loss & Brittle Nails: What's Happening and What Actually Helps
Postpartum hair shedding affects up to half of new mothers. Learn why it happens, when it stops, which supplements are safe while breastfeeding, and what actually speeds recovery.
Dr. Amanda Foster, MD, FACOG
Supplements7 minBiotin and Acne: The Truth About Breakouts from Supplements
Can biotin supplements cause acne? We examine the evidence behind the biotin-breakout connection, how vitamin B5 competition may play a role, and what to do if biotin is triggering your skin issues.
Rachel Kim, MS, RDN, LDN
Conditions8 minWhy Your Nails Have Ridges — And When to Actually Worry
Vertical and horizontal nail ridges can signal everything from normal aging to nutrient deficiencies. Learn what causes ridges in your nails, which vitamins may help, and when to see a doctor.
Dr. Priya Sharma, MD, FAADEvery article follows a rigorous process
We don't publish opinions as research. Every article starts with PubMed literature review, authoring by a licensed dietitian, then medical review by a board-certified dermatologist.
YMYL compliance: no cure claims. "Supports" and "may help" language. Sources cited. Consult your doctor.
Literature Review
PubMed and NIH database search for clinical studies and meta-analyses.
Expert Authoring
Licensed dietitian writes with 5-10 inline PubMed citations.
Medical Review
Board-certified dermatologist verifies accuracy and YMYL compliance.
The Complete Vitamin Handbook
Everything about hair & nail supplements in one peer-reviewed guide.
Rachel Kim, RDN- Dosing protocols for 15+ supplements
- Food sources for every nutrient
- Drug interaction warnings
- Complete 90-day action plan
- Myth vs fact breakdowns
- Pregnancy-safe supplement list
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