What is Andarine S4 by Biaxol?
Biaxol andarine in capsules. It hardens and dries you out at the end of a cut, and it is one of the harder compounds here to tolerate, so the dose stays modest.
Also sold as andarine, S4 or S-4.
Andarine is one of the older SARMs and it produces a hard, dry look rather than size, which is why it sits in cutting phases. It binds the androgen receptor selectively in muscle and bone, and it clears quickly, so it is typically used in short blocks at the end of a cut rather than run for months.
Andarine S4 benefits
- Produces a hard, dry look with no water at all
- Preserves lean tissue through a deficit
- Noticeable improvement in vascularity and definition
- Short half-life, so it clears quickly if it does not suit you
- Useful in the final weeks of a cut rather than through a bulk
- Black pepper fruit extract included at 5mg per capsule, which improves absorption
Andarine dosage
- Starting dose
- 12.5mg per day, half a capsule’s worth
- Common range
- 25 to 50mg per day
- Timing
- Split across the day, or morning only
- Cycle length
- 6 to 8 weeks
- Post-cycle therapy
- Required, plan it before you start
- Half-life
- About 4 hours
The side effects scale directly with dose. One capsule is 25mg, which is a full working dose; if that proves too much, the answer is less rather than pushing through.
Biaxol capsules include 5mg of black pepper fruit extract, which the tablet versions do not. That is the main difference between the formats.
Package content
- Capsules
- 60 per container
- S4 per capsule
- 25mg
- Black pepper fruit extract
- 5mg per capsule
- Half-life
- About 4 hours
- Brand
- Biaxol
At 25mg a day one container covers 60 days.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Andarine S4 for?
People in the last weeks of a cut who want hardness and dryness from a short run.
S4 25 and the Astera version are the same 25mg strength as tablets, which halve more easily than a capsule does.
How to use Andarine S4
Swallow with water, in the morning or split across the day. Start low and increase only if it suits you.




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