Track Your Supplements. See What Actually Works.
Most people take 3-5 supplements daily and have no idea if they're working. You're spending money on hope, not data. ReactLog works by connecting two things: what you take and how you feel. Log your supplements, then check in with your mood and energy throughout the day. The more often you log how you feel, the faster ReactLog spots which supplements are actually making a difference.
You're Spending Money on Supplements You Might Not Need
Americans spend approximately $60 billion annually on dietary supplements—that's roughly $200 per person. Yet despite this massive investment in our health, most supplement users are flying blind. You take a vitamin, an herb, a nootropic, and hope for the best.
The problem is that you can't feel the difference. Does your magnesium actually help you sleep better, or are you sleeping better because you've had less stress this week? Is your energy high because of the creatine, or because you've been exercising more? The placebo effect is real—research suggests 30-40% of the benefit people experience from supplements may be placebo rather than pharmacological.
Without tracking, you're essentially guessing. You might take the same 5 supplements for a year, spending $300, when only 2 of them actually work for you. Or worse, you might quit something that's genuinely helping because you didn't have concrete evidence it was working.
The solution is data. Track what you take alongside how you feel. After 3-4 weeks, patterns emerge. You discover which supplements correlate with better sleep, more stable energy, clearer thinking, or fewer symptoms. You stop wasting money on supplements that don't work for you, and you double down on the ones that do.
How It Works in 3 Steps
Transform supplement guessing into evidence-based decisions.
Log What You Take
Each morning, record which supplements you took and at what dose. It takes 30 seconds. Add the supplement from ReactLog's built-in database or create custom entries. Track dose, timing, and even batch/brand if you want to compare.
Rate How You Feel
Throughout the day, check in with how you feel—mood, energy, focus, sleep quality, and any symptoms you're tracking. The more often you log, the more data ReactLog has to work with. Even a quick 10-second mood check 2-3 times a day dramatically improves your insights. Quick sliders, not tedious forms.
See the Correlations
After 2-3 weeks of consistent logging, ReactLog's on-device analytics surface patterns: "Your energy is 23% higher on days you take creatine + sleep 7+ hours." The more mood and symptom data you've logged, the more confident these correlations become. You see exactly which supplements correlate with your best days.
Track Everything That Matters
ReactLog adapts to your unique health journey. Track any combination of these:
Supplements & Doses
Vitamins, minerals, herbs, nootropics, probiotics, protein, and custom entries
Mood & Energy
Daily mood rating, energy level, motivation, and emotional state
Sleep Quality
Sleep duration, quality, wake-ups, and morning grogginess
Brain Fog & Focus
Mental clarity, focus duration, distractibility, and cognitive performance
Exercise & Activity
Workout type, duration, intensity, and physical activity level
Symptoms & Health
Any symptoms you're tracking: headaches, anxiety, pain, digestion, skin, etc.
Food & Diet
Meals eaten, nutrients, and dietary patterns
Custom Tracking
Create unlimited custom metrics unique to your health goals
Your Supplement Data Stays on Your Phone
Why privacy matters for supplement tracking.
Your supplement use reveals things about you that are deeply personal: health conditions you're managing, mental health concerns, lifestyle choices, vulnerabilities. You don't want that data on someone else's server.
Traditional apps sell your health data to data brokers, insurance companies, and advertisers. Some are sold even when companies claim they won't be. ReactLog takes a fundamentally different approach:
- No backend servers — Your data lives on your device only. Period.
- No analytics SDKs — We don't send telemetry about your usage patterns.
- No data collection — We have nothing to collect. No servers means no data pipeline.
- No account required — You don't need to create a login. No username, no email, nothing that identifies you.
- Face ID/Touch ID lock — Your supplement data is biometrically protected on your phone.
We charge for the app instead of charging you with your privacy. It's a sustainable business model that aligns our interests with yours. We want you to use ReactLog, but we don't want your data.
Frequently Asked Questions
How do I know if my supplements are working?
Track consistently for 3-4 weeks alongside the outcomes you care about—mood, energy, sleep, or specific symptoms. After this period, ReactLog automatically detects patterns and surfaces correlations. For example: "Your energy is 23% higher on days you take creatine + sleep 7+ hours." You'll see which supplements correspond with improvements in the metrics you care about most.
What supplements can I track?
Any supplement. Vitamins (A, B-complex, C, D, E, K), minerals (magnesium, zinc, iron, calcium), herbs (ashwagandha, rhodiola, turmeric), nootropics (piracetam, phenibut, L-theanine), probiotics, protein powder, creatine, fish oil, CoQ10, NAC, and unlimited custom entries. If you take it, you can track it.
How long until I see patterns?
Most users start seeing meaningful correlations after 2-3 weeks of consistent daily tracking. The quality of patterns depends on consistency—tracking every day gives you better data than tracking 5 days a week. Some users discover significant patterns in as little as 10-14 days, while others want 4-6 weeks to feel confident. Consistency matters more than duration.
Is my supplement data private?
Yes, absolutely. ReactLog has no backend servers and zero data collection. Your supplement logs, mood entries, sleep ratings, and all the data you track never leaves your iPhone. We use on-device processing only. You can lock the app with Face ID or Touch ID for an additional security layer. Your data is yours alone.
Is ReactLog free?
ReactLog offers a 14-day free trial with full access to all features. After the trial, choose Monthly ($2.99/month) or Yearly ($29.99/year). No account required. Your data stays on your device.
Stop Guessing. Start Tracking.
Start your 14-day free trial. No account required. Your supplement data stays on your phone.