Karim Gaad

Founder of BioTrakk

I'm a software engineer and startup CTO, and I built BioTrakk because I wanted an honest answer to a simple question: which of the things I do every day actually change how I feel and what my labs say?

I was logging food in one app, sleep in another, supplements in a spreadsheet and blood work in a folder of PDFs — and none of them talked to each other. So I built a tracker you talk to like a person (on Telegram, WhatsApp or the web) that pulls everything into one timeline and runs real statistics on it: correlations with p-values, not vibes, and structured N-of-1 experiments with baselines and honest verdicts, including "inconclusive".

Everything I publish here follows the same rules I built into the product: numbers over adjectives, primary sources cited for every claim, and plain statements about what the evidence does and doesn't show. I'm not a doctor and nothing here is medical advice — I'm an engineer who takes measurement seriously.

Latest articles

Biomarkers · 7 min readOptimal Fasting Insulin: Ranges, HOMA-IR, and Why Lab-Normal Is Not OptimalOptimal fasting insulin level: under 5 µIU/mL. Labs flag only above 25. Interpretation bands, the HOMA-IR formula, and evidence-based ways to lower it.Biomarkers · 6 min readApoB Optimal Range: What Your Number Means and How to Lower ItApoB optimal range: under 80 mg/dL (0.80 g/L); 100–119 is high. What ApoB 110 means, ApoB vs LDL, and how to lower ApoB naturally, with cited numbers.Biomarkers · 7 min readCortisol Levels by Time of Day: Normal Ranges Chart (µg/dL and nmol/L)Cortisol levels by time of day: normal ranges at 8 a.m., noon, 4 p.m. and midnight in µg/dL and nmol/L, plus the awakening response and saliva vs blood tests.Biomarkers · 6 min readOptimal Ferritin Levels: What Labs Call Normal vs What the Evidence SupportsOptimal ferritin levels sit around 50–150 ng/mL. Why a “normal” 30 can still mean fatigue, hair loss or restless legs — and how to raise ferritin safely.Supplements · 7 min readGlycine for Sleep: Dosage (3 g), Timing, and What the Evidence Really ShowsGlycine for sleep: take 3 g about 30-60 minutes before bed. Dosage protocol, what the studies really show, side effects, and glycine vs magnesium.Supplements · 6 min readMagnesium Glycinate vs Threonate: Which One Should You Actually Take?Magnesium glycinate vs threonate: glycinate for sleep and repletion, threonate for brain claims. Doses, cost, evidence and a full types-of-magnesium chart.