Sustanon 400

Description

Sustanon 400 takes the proven multi-ester testosterone blend and concentrates it to 400mg/mL — delivering 60% more total testosterone per millilitre than standard Sustanon 250, with the same four-ester complementary release profile in a reduced injection volume. The pharmacokinetic advantage of the blend is preserved: short esters (propionate, phenylpropionate) ensure rapid initial elevation, medium esters (isocaproate) bridge the gap, and the long-acting decanoate fraction maintains steady-state for days after injection. At 400mg/mL, a single 1mL injection provides a meaningful weekly testosterone dose, making this formulation particularly suited to higher-volume protocols where minimising injection frequency and volume is a priority. The concentration requires thorough mixing before drawing and attention to injection site comfort from the higher oil density. Essential oestrogen monitoring and management apply at all testosterone doses. Verified at 99%+ purity by Puralytix. At 400mg/mL, injection once weekly at 1mL delivers 400mg of testosterone — an effective TRT-level dose in a single injection. For cycle use at 800mg weekly, 2mL twice weekly provides the balanced pharmacokinetics of the multi-ester blend. The higher concentration requires warming the vial before draw and thorough injection site rotation.