Bolden U 300 – Boldenone Undecylenate

Bolden U 300 is boldenone undecylenate from Syncom Labs, dosed at 300 mg per ml. It is a long-ester injectable anabolic steroid known for steady lean mass gains, better vascularity, and a noticeable rise in appetite. Because the ester is long, effects build gradually over the course of a cycle rather than showing up in the first couple of weeks.

As a guide and not medical advice, most cycles run boldenone at 300 to 400 mg per week for 12 to 16 weeks, usually split across two injections. It is almost always paired with a testosterone base rather than used alone, since its own onset is too slow to carry a cycle by itself. Always base your own decisions on bloodwork and professional medical guidance.

Yes. Testosterone is used as a base to keep normal hormonal function going while boldenone is in your system, and an anti-estrogen such as anastrozole is commonly kept on hand in case oestrogen-related sides appear from the testosterone base. A PCT protocol is also expected afterward, so anti-estrogen support should be planned in from the start rather than added as an afterthought.

Users commonly report increased appetite, acne, and in men already prone to it, some hair thinning. It can also pull HDL cholesterol down, so a lipid panel alongside total testosterone, oestradiol, LH and FSH before, during and after the cycle is worth doing. This is general information, not a substitute for consulting a doctor about your own bloodwork.

Not really. Boldenone's slow onset and long detection time make it a poor choice for a first cycle, where it is harder to judge how your body is responding early on. Most people are better off starting with a testosterone-only cycle to gauge tolerance before adding a secondary compound like boldenone later.

Every batch of Bolden U 300 we stock is authentic Syncom Labs product, and each box carries its own verification check-code so you can confirm it before use. Orders placed before midday on a working day go out the same day via Royal Mail Tracked 24 in plain, unmarked packaging, with most UK customers receiving their parcel within one to two working days.