How long does vitamin b12 last in your system Pro Research Analysisby Searched over 200M research papers Duration of Vitamin B12 in the Human System Biological Half-life of Vitamin B12 in Plasma The biological half-life of vitamin B12 in plasma is a critical factor in understanding how long it lasts in the human system
And many of them, if not explicitly counseled otherwise, will do exactly that

Common side effects (minimal) Most people: No side effects GHK-Cu extremely well-tolerated Natural peptide (found in body) Minimal adverse effects Possible minor effects: Injection site stinging (common, harmless) Minor bruising at injection sites Slight blue tint to injection site (copper, temporary) Mild headache (rare) Managing side effects: Stinging: Inject slowly, warm peptide to room temp Bruising: Rotate sites, proper technique Blue tint: Normal, fades within days Headache: Hydrate well, reduce dose Contraindications and cautions Avoid if: Pregnancy or breastfeeding (no data) Active cancer (theoretical copper concerns) Wilson's disease (copper metabolism disorder) Hemochromatosis (iron overload, copper caution) Use caution with: Copper supplements (avoid taking both) High copper foods (monitor intake) Liver disease (copper metabolism) Generally safe for: All ages (adults) Men and women Long-term use Most health conditions Copper toxicity concerns Is copper in GHK-Cu dangerous

You still need to control your diet
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Vitamin B-Complex includes a group of essential B vitamins (such as B1, B6, and B12) that support energy, brain function, and metabolism