The common ones
Nausea, reduced appetite, constipation and fatigue are the side effects reported most often, especially in the first few weeks at a new dose. They tend to fade as the body adjusts.
Timing
Side effects are usually strongest two to four days after a dose, then ease off before the next one, which is a pattern that only becomes obvious once you’ve written a few weeks down side by side.
Less common reports
Some people report heartburn, changes in taste, or hair thinning several months in, usually tied to rapid weight loss rather than the peptide itself. Injection site reactions (redness, a small lump) are also reported and typically clear within a few days.
Why a written log catches patterns a memory doesn’t
A side effect that seems random in the moment often turns out to correlate with something specific, a particular injection site, a dose step, a day of the week, once it’s written down over several entries rather than recalled after the fact.
When to slow down
If a side effect doesn’t ease after a week or two, many people hold at their current dose rather than increasing on schedule. This is a personal judgement call, not medical advice, and nothing here should be read as an instruction for how any individual should proceed.