What happens during freezing
As ice forms it excludes solutes, concentrating everything dissolved into the shrinking liquid fraction. That transient concentration can be many times the nominal value, and it drives association between molecules that would otherwise stay apart.
pH can also shift during freezing as buffer components crystallise at different rates, exposing the peptide to conditions it was never intended to see.
Why cycling compounds
Each cycle repeats the concentration and pH excursion. Damage accumulates: aggregates formed in one cycle seed further aggregation in the next. Ten cycles is not one cycle ten times as long — it is ten separate insults.
Practical consequence
Where solution must be stored frozen, dividing it into single-use portions means each is thawed once. That is the entire rationale for aliquoting, and it applies far more strongly to proteins than to short peptides.
Dry material
Lyophilized powder does not have this problem, since there is no solution to concentrate. It is another reason the dry form is the shipped and stored form.
Research use only. This page is explanatory and does not recommend any use, quantity or procedure. REVIVE LAB supplies reference materials for laboratory research. These are not medicines and are not for human or veterinary consumption. Anyone considering the use of any compound in humans should do so only under qualified medical supervision.