Guides & tools:
pick your starting point.

200+ compounds across TRT, GLP-1, growth peptides, fat loss, longevity, cognitive enhancers, and supplements. Each entry has typical dosing, half-life, and route notes, the same reference the OptiPin app draws from.

Best for: looking up a specific compound, comparing options within a class, getting dosing references.

End-to-end walkthrough for first-time peptide users: vial reconstitution math, BAC water selection, syringe units, injection sites, storage, and the most common mistakes that ruin a vial.

Best for: first peptide cycle, BPC-157, GH peptides, anyone reconstituting from lyophilized powder.

Step-by-step injection technique for testosterone: intramuscular vs subcutaneous, needle gauge selection, draw and inject sequence, the seven main injection sites, and post-injection care.

Best for: first TRT shot, switching from IM to SubQ, dialing in technique to reduce post-injection soreness.

Vermeulen equation – enter total testosterone, SHBG, and albumin to get free testosterone, bioavailable testosterone, and percent free.

Turn a weekly testosterone dose and vial concentration into the exact mL and insulin-syringe units per injection – and how long a vial lasts.

Plot single-dose and steady-state blood-level curves for 60+ compounds, with time-to-peak and time-to-steady-state.

The pharmacokinetic model behind OptiPin's level curves, in plain language – and how a single bloodwork result calibrates the forecast to your own physiology instead of a population average.

Mix HCG and get the exact insulin-syringe units to draw for your target IU dose, plus concentration and doses per vial.

Units to mL to mcg. Why 1 unit is always 0.01 mL, mcg-per-unit tables for every common reconstitution, testosterone concentrations, and the U-40 warning.

How many units is your mg or mcg dose? Enter the vial and the water, or the printed mg/mL, then read the units. Includes the 1 mg, 2 mg and 5 mg cases.

How much drug is in the units you drew? Units are a volume, so the concentration decides whether 10 units is 250 mcg or 1000 mcg.

Divide by 100 on a U-100 barrel. The one syringe conversion that never depends on what is in the vial, with the full table and the U-40 warning.

For vials labeled in international units. Vial IU plus diluent gives milliliters and syringe units, with the 3.0 IU/mg somatropin factor.

ng/dL to nmol/L and back – then what the result means. Is 300 ng/dL low? Is 15 nmol/L normal? Every common value banded against the harmonised range.

How long peptides last as powder and in solution, why the 28-day figure is a preservative limit rather than a stability one, and the five mechanisms that degrade peptides.

Loading a cartridge, priming, dialing units, needle changes, storage and when a syringe is the better tool, drawn from the pen makers' manuals.

The NHS prescription charge, private clinic plans compared and the monitoring blood tests you pay for either way, with prices checked in October 2026.

How many doses and weeks a vial lasts, plus cost per dose and per week from vial size, concentration, dose, and frequency.

TRT Pillar

Diagnosis, dosing, TRAVERSE, hematocrit, supraphysiologic considerations.

GLP-1 Pillar

Compound choice, titration, side effects, switching, maintenance.

Peptides Pillar

Categories, evidence, regulatory state, building a protocol.

Minimizing Hair Loss on TRT

The full stack – topicals, oral options, and why we steer clear of finasteride – for androgen-driven hair loss.

Microneedling Guide

Needle depth, frequency, and how to pair it with minoxidil for hair regrowth – step by step.

Red Light Therapy

Low-level laser / red light (LLLT) for hair density and skin recovery – what the evidence supports and the device power that actually matters.

Blue Light Therapy

Targeting the hormone-driven acne and skin breakouts that can come with TRT and anabolics.