Semaglutide and tirzepatide have changed the landscape of weight management and metabolic health. But most people tracking their GLP-1 protocol are only logging the dose. The dose is the least interesting data point. Here’s what to track instead — and why it matters.
What a GLP-1 actually does in your body
GLP-1 receptor agonists work through multiple mechanisms simultaneously: slowing gastric emptying, reducing appetite signalling, improving insulin sensitivity, and — increasingly relevant — reducing inflammation. The dose you inject is just the input. The outputs are what matter, and they’re all measurable.
Most people on semaglutide or tirzepatide are tracking one thing: weight. Some track side effects informally in their head. Very few are tracking the full picture that would actually tell them whether their protocol is working as well as it could — or alerting them to something worth adjusting.
The core insight: A GLP-1 protocol produces effects across multiple systems — metabolic, gastrointestinal, hormonal, inflammatory, and neurological. Tracking only weight tells you roughly one fifth of the story.
What to actually track
1. Side effects — specifically, when they happen
Nausea, fatigue, GI disturbance, and appetite suppression are the most common GLP-1 side effects. Most people know this. What most people don’t track is when they occur relative to the injection.
For a weekly compound like semaglutide, side effects typically peak in the 12–48 hours post-injection and taper from there. But individual pharmacokinetics vary. If you’re logging the day and time of each injection alongside a daily side effect score, you’ll quickly see your personal pattern — and can use that to time injections around social events, work commitments, or training.
If you’re not logging when the side effects occur, you can’t distinguish between “this dose is too high” and “I injected on the wrong day of the week for my schedule”.
2. Energy and cognitive function
GLP-1 agonists have documented effects on neuroinflammation and cognitive function — both in the research literature and anecdotally among users. Some people experience improved mental clarity. Others experience brain fog, particularly in the first few weeks or after dose increases.
Track your energy (1–10), cognitive sharpness, and mood daily. Map it against your injection schedule. The pattern that emerges is usually informative — and often surprising. Many people find that the cognitive effects have a distinct pattern that differs from the GI side effect pattern.
3. Appetite suppression — the actual mechanism you’re trying to activate
GLP-1 protocols work largely through appetite reduction. But appetite suppression isn’t binary. Tracking it helps you understand whether your current dose is achieving the effect you want, when it peaks and troughs across the week, and whether it’s changing over time (a sign of tolerance developing, or protein intake shifting).
A simple 1–5 hunger score logged at the same time each day gives you actionable data. If appetite suppression drops off significantly in the last two days before your next injection, that’s information about whether your dosing frequency is optimal for you personally.
4. Blood markers — at the right intervals
The blood markers most relevant to a GLP-1 protocol are:
- Fasting glucose and HbA1c — the primary metabolic markers. HbA1c at baseline, 3 months, and 6 months gives you the trend.
- Fasting insulin and HOMA-IR — insulin resistance markers, often more sensitive to GLP-1 effects than glucose alone.
- Lipid panel — GLP-1s commonly improve LDL and triglycerides, particularly in the context of caloric reduction.
- CRP — GLP-1 agonists have anti-inflammatory effects. C-reactive protein can reflect this.
- Liver enzymes (ALT, AST) — particularly relevant if managing non-alcoholic fatty liver disease or taking the protocol in the context of metabolic syndrome.
Log each blood draw in your tracker with the date. Over six months, the trend line tells a more useful story than any individual result.
- Injection date, time, site, and dose
- Daily side effect score (nausea, GI, fatigue) with timestamp
- Daily energy and cognitive function (1–10)
- Daily hunger score, same time each day
- Weight, at the same time of day (morning, post-bathroom, pre-food)
- Blood markers when drawn — HbA1c, glucose, lipids, CRP
Understanding where your levels actually are
Semaglutide has a half-life of approximately 7 days, which is why once-weekly dosing maintains relatively stable serum levels. Tirzepatide has a similar half-life of around 5 days. But “relatively stable” is not “completely stable” — there is a peak in the 24–72 hours post-injection and a trough before the next dose.
Serum level modelling — calculating where you are on the absorption and elimination curve based on your logged doses — can help you understand whether side effects correlate with your peak level, and whether the trough before your next injection is contributing to increased appetite or reduced efficacy.
This isn’t a substitute for blood work. But it adds a layer of context that raw dose logging can’t provide, particularly when you’re titrating up or considering a frequency change.
Tracking through titration
Most GLP-1 protocols involve a titration schedule — starting low and increasing the dose every 4–8 weeks. The purpose of titration is to let your body adapt and minimise side effects. If you’re logging properly, you’ll be able to see how your side effect burden changes at each new dose level, how long adaptation takes, and whether you need more time at a dose before moving up.
Without this data, dose increases are largely based on calendar rather than your actual response. With it, you can make the case to yourself — and to your prescriber — for or against moving up.
Important: This article describes tracking strategies for informational purposes. Any changes to your GLP-1 protocol — dose, frequency, compound — should be made in consultation with your prescribing physician. Serum level estimates are pharmacokinetic models, not blood test results.
What not to obsess over
Daily weight. It will fluctuate by 1–3kg depending on hydration, salt intake, time of day, and hormonal cycle. Logging it daily is fine — obsessing over daily fluctuations is not. The signal is the weekly or monthly trend, not the day-to-day noise.
Similarly, don’t use a single blood result to judge the protocol. Individual values are less informative than trends. The HbA1c at 6 months compared to baseline tells a more useful story than whether this month’s reading is 0.1% higher than last month’s.
Putting it together
A well-tracked GLP-1 protocol gives you the data to answer the questions that actually matter: Is this working? Is this dose right for me? Are the side effects something to wait out or a signal to adjust? What does my prescriber need to know at my next appointment?
The people who get the most out of GLP-1 protocols are typically the ones who treat their body as a system to understand rather than a result to wait for. That requires data. And the data is only useful if it’s captured consistently, in context, and with enough detail to reveal patterns — not just a number on a scale.
Sequa is a health tracking app designed to help you log and understand your GLP-1 protocol alongside any conditions, symptoms, or other compounds you’re managing. The protocol manager supports 17 GLP-1 compounds including semaglutide, tirzepatide, and retatrutide, with serum level curves, what-if simulation, and injection site rotation. Join the waitlist to be notified at launch.