Instead of DIY, look for reputable, third-party tested serums that list GHK-Cu (or copper tripeptide) and supportive ingredients like hyaluronic acid, antioxidants (vitamin C), and soothing agents (aloe vera)
If you feel constantly tired and your levels of B12 are low, bringing them up to normal may give you more energy, studies show
References Frank DN, Zhu W, Sartor RB, Li E
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The temperature must be maintained between 2-8C (36-46F)