Blog
Plain-language guides on syringe math, GLP-1 trials, TRT bloodwork, injection technique and more, with every claim sourced.
- Hormones & labs · November 15, 2026 · 3 min read
Blood tests on TRT: which labs, and when
The testosterone monitoring schedule from the Endocrine Society guideline, what each marker tells you, when to draw blood between injections, and what common practice adds.
- Mixing & syringes · November 15, 2026 · 4 min read
How many units is that? Reading an insulin syringe for peptides
What a "unit" on a U-100 insulin syringe means, the two-step math from mg to units, worked examples, and the mistakes that cause wrong doses.
- Practical · November 15, 2026 · 3 min read
Injection site rotation: why it matters and a simple plan
What happens when you inject the same spot too often, where the usual subcutaneous and intramuscular sites are, and an easy rotation plan backed by injection-technique research.
- GLP-1s · November 15, 2026 · 4 min read
Tirzepatide vs semaglutide vs retatrutide: what the trials show
How the three weekly weight-loss injections work, the weight loss each produced in their main trials, the one head-to-head trial, side effects and approval status.