Acetic Acid (dilute, for reconstitution): literature-reported ranges
Some peptides — IGF-1 analogues most notably — do not dissolve or remain stable in neutral water. Published handling protocols use dilute acetic acid to bring them into solution before further dilution.
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Every figure on this page is a range reported in published literature or in a publicly documented study protocol. It is a record of what researchers used, not a recommendation, a therapeutic protocol, or advice. Peptide Intel Hub is an independent publication, sells nothing, and describes these compounds as in-vitro research reagents only.
Compound at a glance
Class
Dilute acid diluent for poorly water-soluble peptides
Reported half-life
Not applicable — a diluent, not an active compound
Routes used in the literature
Diluent used before dilution into an aqueous buffer
Also written as
—
What the published studies reported
Each row below describes one body of work. The model and population are part of the figure — a rodent per-kilogram quantity and a human trial quantity are not comparable.
Standard dissolving concentration in handling protocols
Reported quantity
0.1% to 0.6% acetic acid in sterile water (roughly 10–100 mM)
Frequency
Once, at initial dissolution
Study duration
Followed immediately by dilution into the working buffer
0.6% is the figure most commonly cited for IGF-1 family peptides.
Peptide solubility screening practice
Reported quantity
Acidic diluents for basic peptides; dilute ammonium hydroxide for acidic peptides
Frequency
Per preparation
Study duration
Immediate use
Choosing the diluent by the peptide's net charge is standard laboratory practice.
Reconstitution maths
Dissolve in the smallest workable volume of dilute acid, confirm the solution is clear, then dilute into the final buffer. A cloudy solution indicates incomplete dissolution, not a concentration error.
Acidic solutions are irritant and are not a general-purpose substitute for bacteriostatic water.
Dilute acetic acid contains no preservative — it does not make a vial multi-entry.
Acid-sensitive peptides degrade in these conditions; check the specific peptide's handling data first.
Sources and citations
These are the published records the figures on this page are drawn from. Each one describes what researchers administered, in which model or population, and over what period. Quantities reported in a study are specific to that study's design and are not transferable guidance.
Authoritative technical guideline recommending dilute acetic acid (e.g., 0.1%-10%) as a solubilization solvent for basic/hydrophobic peptides that are poorly soluble in water alone.
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Peptide Intel Hub is an independent educational publication. We are not affiliated with, owned by, or the same company as Regena Peptides and Regena.app (regena-peptides.com / regena.app). We do not sell, supply, ship or take payment for any compound. Because readers regularly ask where compounds discussed in published studies can be sourced for laboratory work, we list Regena Peptides and Regena.app as suppliers we have verified and trust — every batch is released with a lot-matched third-party certificate of analysis (HPLC purity and mass-spectrometry identity). Outbound links are marked nofollow/sponsored and are provided to help readers, not to sell.