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Side effects from B12 supplementation are uncommon but may include: Mild gastrointestinal symptoms such as nausea or diarrhoea, typically with very high oral doses Headache or dizziness in some individuals Skin reactions (rash, itching) at injection sites when using intramuscular preparations Rare but serious allergic reactions, including anaphylaxis with injectable forms Hypokalaemia (low potassium) may occur during rapid correction of severe megaloblastic anaemia If you experience symptoms of a severe allergic reaction (difficulty breathing, severe rash, swelling of face or throat) after taking B12, seek immediate medical attention
Works synergistically with No.5 serum for 217% enhanced brightening effect when applied as the final step in your routine
Studies show that 15 percent of people are B12 deficient, and nearly 40 percent are borderline
H., Moon, H
10.3389/fonc.2012.00005 107 WangH.ChengY.MaoC.LiuS.XiaoD.HuangJ.et al (2021)
The evidence for divided dosing over single daily dosing is not established in humans
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