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Shaking looks faster, but it forces the air above the powder into the liquid as foam, and you have to wait for that foam to settle before you can draw so it doesnt save time
This may manifest as hives (red, itchy bumps), general redness, or localized swelling
Others titrate more slowly to minimize side effects
Journal of clinical pharmacy and therapeutics 2021
Copper peptides (GHK-Cu) are touted as a "slow-aging" ingredient in many skincare products
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