Free Interactive Health Tools
23 interactive calculators, quizzes, comparisons, and trackers — designed by healthcare professionals to help you make informed supplement decisions. No account required.
Biotin Dosage Calculator
Personalized biotin dosing by age, weight, and health goals. Factors in acne sensitivity, current medications, and pregnancy status to recommend an evidence-based dose between 30mcg and 10,000mcg. References the 1993 Cutis study benchmark of 2.5mg for brittle nails.
Treatment Cost Calculator
Compare the true monthly and annual costs of different supplement brands, OTC treatments, and prescription options. Factors in dosage frequency, insurance coverage for Rx, and subscription discounts to show the real cost per day of treatment.
Lab Test Interpreter
Input your lab values for ferritin, zinc, vitamin D, biotin, and thyroid markers (TSH, T3, T4) to get a plain-language interpretation. See how your levels compare to optimal ranges for hair and nail health, not just "normal" reference ranges, and get targeted supplement recommendations.
Ingredient Decoder
Paste or type a supplement label and instantly identify every active ingredient, its dose, clinical evidence level, and what it does for hair and nail health. Flags proprietary blends, hidden fillers, and doses below clinical thresholds.
Nail Health Quiz
Comprehensive 10-question nail assessment covering shape, color, texture, ridges, brittleness, and growth rate. Identifies potential causes (nutritional deficiency, fungus, trauma, systemic conditions) and provides personalized supplement and care recommendations.
Hair Loss Identifier
Pattern analysis quiz that distinguishes diffuse thinning, receding hairline, patchy loss, widening part, and excessive shedding. Identifies probable causes (androgenetic, telogen effluvium, alopecia areata, nutritional, hormonal) and suggests targeted treatment paths.
Fungus Severity Checker
Visual and symptom-based assessment that scores nail fungus severity from mild to severe. Factors in affected nail area percentage, thickness, color changes, pain level, and number of nails involved. Recommends appropriate treatment tier: OTC topical, prescription topical, or oral antifungal.
Deficiency Risk Checker
Comprehensive lifestyle, diet, and symptom screening that calculates your risk for iron, zinc, biotin, vitamin D, B12, and omega-3 deficiencies. Scores each nutrient independently and recommends targeted blood tests and supplementation priorities.
Pregnancy Supplement Checker
Trimester-aware safety checker for 25+ hair and nail supplements. Each product is rated as safe, use with caution, or avoid based on FDA pregnancy categories, known teratogenic ingredients (saw palmetto, high-dose vitamin A), and current OB-GYN guidelines.
Nail Ridges Matcher
Identify the type, direction, and severity of your nail ridges, then match them to the most likely cause. Distinguishes normal aging ridges from those caused by nutrient deficiencies, trauma, eczema, thyroid disorders, and systemic conditions like Beau's lines.
Fungus vs Psoriasis Quiz
Symptom comparison quiz that helps distinguish nail fungus from nail psoriasis and nail trauma. Evaluates color, texture, shape, skin involvement, pain patterns, and affected nail distribution to suggest the most likely condition.
When to See a Doctor
Red-flag screening quiz that evaluates your nail or hair symptoms against clinical warning signs. Determines whether your situation warrants immediate medical attention, a routine dermatologist visit, or safe self-care with OTC options.
Supplement Matcher
Input your age, sex, health concerns, budget, lifestyle, and preferences to receive ranked supplement recommendations with personalized match percentages. The algorithm weighs clinical evidence, ingredient relevance, safety profile, and value to find your best options.
Supplement Comparison
Side-by-side comparison of any 2-3 supplements from our database. Compare ingredients, doses, clinical evidence, price per day, certifications, pros and cons, and user ratings in one unified view. Export or share your comparison.
Biotin vs Collagen
Deep-dive comparison between biotin and collagen supplementation for hair and nail health. Covers mechanisms of action, clinical evidence, best use cases, combination potential, and who benefits most from each approach. Includes a short quiz to route you to the better option.
Topical vs Oral Comparison
Compare topical treatments (nail strengtheners, antifungal oils, prescription lacquers) against oral supplements and medications for different nail and hair conditions. Evaluates efficacy, convenience, side effects, cost, and speed of results.
Treatment Comparison Engine
Multi-treatment comparison matrix for nail fungus: OTC topicals, natural oils, prescription topicals, oral antifungals, and laser therapy. Compare cure rates, treatment duration, cost, side effects, and convenience in a structured decision table.
Dosage Tracker
Track daily supplement intake with a visual calendar, streak counter, and consistency score. Set custom schedules for multiple supplements with timing reminders (morning, with food, evening). All data stored locally in your browser — never sent to our servers.
Before-After Timeline
Visual timeline showing what to expect from your supplement at weeks 2, 4, 8, 12, and 24. Based on clinical study data and real user reports. Set your start date to see personalized milestone dates and track your progress against the expected curve.
Drug Interaction Checker
Check for known interactions between supplements and common medications. Covers blood thinners (warfarin), thyroid medications, acne treatments (isotretinoin), birth control, diabetes medications, and more. Flags critical, moderate, and minor interactions with explanations.
Vitamin Stacking Guide
Interactive guide to combining supplements safely and effectively. Shows which nutrients enhance each other (vitamin C + iron, vitamin D + K2), which compete for absorption (zinc + copper, calcium + iron), and optimal timing for each combination.
Myth vs Fact Quiz
Interactive myth-busting quiz with 20+ common supplement misconceptions. Test your knowledge about biotin dosing, collagen absorption, nail fungus treatments, and hair growth claims. Each answer reveals the evidence-based truth with citations.
Photo Nail Assessment
Visual reference guide with high-quality reference images of common nail conditions: fungus stages, ridges, pitting, discoloration, brittleness, spoon nails, and clubbing. Compare your nails against categorized examples to identify potential conditions.
Built different from every supplement quiz you've tried
Most supplement quizzes are sales funnels. They ask generic questions and always recommend the highest-commission product.
Our tools run in your browser — no data sent to servers. Algorithms factor in drug interactions, acne sensitivity, and pregnancy safety.
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
No spam · Unsubscribe anytime · Reviewed by Dr. Robert Langford, MD