Two hormones share this 10 ml vial: 200 mg of boldenone undecylenate and 200 mg of testosterone enanthate per millilitre, 400 mg of steroid in total.
The pairing is deliberate. Testosterone enanthate is the androgen the body itself produces, carried on a seven-carbon ester; boldenone undecylenate is a close derivative on a much longer one. Their release rates differ, but both are measured in days rather than hours, so one injection covers both compounds.
A premixed blend fixes the ratio at the factory — nothing in this bottle can be adjusted separately.