What is Pump Pro (Astera Labs)?
The same three nitric oxide precursors as Pump, plus heptaminol. That fourth ingredient is a stimulant and it is prohibited in tested sport.
Arginine, ornithine and citrulline all feed the nitric oxide pathway, which is what widens blood vessels and produces the pump. Citrulline is the one that matters most: it converts to arginine in the kidneys and raises blood arginine more reliably than arginine itself does, because arginine taken directly is largely broken down before it gets there. Heptaminol is the fourth ingredient and it works differently: it is a mild stimulant that increases cardiac output, which is where the extra intensity comes from rather than from the amino acids.
Pump Pro benefits
- Four ingredients rather than three, with a stimulant edge the plain version does not have
- Heptaminol increases cardiac output, which shows as drive during a session
- Injectable, which avoids the poor oral absorption that limits arginine capsules
- Not hormonal, so nothing is suppressed and no post-cycle therapy applies
Pump Pro dosage
- Standard
- 1ml, 30 to 45 minutes before training
- L-arginine
- 50mg per ml
- L-ornithine
- 50mg per ml
- L-citrulline
- 50mg per ml
- Heptaminol HCL
- 50mg per ml
- Frequency
- Training days only, not late in the day
1ml half an hour or so before training. Not in the evening, since heptaminol is a stimulant and it will affect sleep in a way the plain version does not.
Count it toward your total stimulant load for the day if you also take caffeine or a pre-workout.
Package content
- Vial
- 10ml multidose
- Total actives
- 200mg per ml
- L-arginine
- 50mg per ml
- L-ornithine
- 50mg per ml
- L-citrulline
- 50mg per ml
- Heptaminol HCL
- 50mg per ml
- Brand
- Astera Labs
At 1ml per session one vial covers ten sessions.
Store below 30°C. Protect from light. Do not freeze. Keep out of reach of children.
Who is Pump Pro for?
People who want a stimulant edge alongside the pump and who do not compete in a tested sport.
If you are tested, use the plain Pump instead. It also carries higher doses of the three amino acids, since it does not have to make room for the heptaminol.
How to use Pump Pro
Draw 1ml and inject subcutaneously or intramuscularly. Intramuscular is preferred, since these solutions can irritate under the skin. Rotate sites and wipe the stopper before every draw. The injection technique guide covers it.




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