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Purchasing from unverified vendors carries documented risk: no guarantee of purity, composition consistency, or absence of contaminants far from the standards expected of regulated products

Thinner needles higher gauge numbers -are generally less painful

Without enough vitamin B12 in your system, you may experience brain fog, poor moods, trouble sleeping, and changes in appetite

2015 Summer;45(4):426-32

Bruising occurs when the needle passes through a small blood vessel under the skin

Each 1 mL contains 100 mg vitamin B (thiamine HCl), 2 mg vitamin B (riboflavin-5-phosphate sodium), 100 mg vitamin B (niacinamide), 2 mg vitamin B (dexpanthenol), and 2 mg vitamin B (pyridoxine HCl)