Cerebrolysin vs P21

Name: Cerebrolysin vs P21
Published: 2026-10-24

Updated Oct 24, 20267 sources

Key differences

1P21 came from working out which part of Cerebrolysin's effect runs through CNTF. It is one defined molecule, not a pig-brain extract.
2Cerebrolysin is injected into muscle in large volumes; P21 goes by nasal spray or small injections under the skin.
3One user called them cousins: Cerebrolysin broader, P21 stronger in a few areas, with benefits that faded sooner after stopping.

Facts from each record, in the same words as their own pages.

Cerebrolysin and P21 side by side
	Cerebrolysin	P21
Category	Cognitive	Cognitive
Evidence	Some human trials	Animal data only
FDA status	Not FDA approvedRegulatory	Not FDA approvedRegulatory
WADA	Not prohibited	Not confirmed
Half-life	Cannot be measured directly, because the peptides resemble the body's own. Wikipedia notes some of its peptides are short-lived in blood, citing BDNF at about 10 minutes.Reference work	Not reported
Routes	Intravenous (IV), Intramuscular injection, Subcutaneous injection	Nasal, Subcutaneous injection
Forms	Ready-to-use vial, Vial (powder)	Vial (powder), Nasal spray
Reported doses	2,152 to 12,912 mg (intravenous (iv)) 1,076 to 2,152 mg (intramuscular injection) 20 to 32 mg (subcutaneous injection)	1 to 4 mg (nasal) 500 to 1,000 mcg (nasal) 100 to 1,000 mcg (subcutaneous injection)
Most cited frequency	20 to 50 mL once a day, started as soon as possible	Once daily
Vial sizes	60 mgCompetitor guide	5 mg, 10 mg, 50 mg, 100 mgCompetitor guide
Mixed vial keeps	Research powder once mixed: fridge at 2 to 8 C, away from light.Competitor guide	Refrigerate at 2 to 8 C and use within 28 to 30 days.Competitor guide
Protocols on file	11	10

Doses shown are what sources report, labelled by origin. Not medical advice.

7 sources, each checked by date. Record updated Oct 24, 2026. Numbers are restated in our own words and labelled by where they came from.