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12

Most people tolerate B12 supplementation well, even at doses significantly higher than the recommended daily amount

You can use Retinol, but do not layer it with Glutathione

Key red flags include pregnancy (no safety data, so contraindicated), active cancer (caution due to growth effects), autoimmune disorders, or organ failure

For those who have difficulty with large pills, keep in mind that only a very small amount of B-12 is required to meet the recommended daily intake and can be obtained in small tablets, including those tested by ConsumerLab.com in its B Vitamins Supplements Review , which includes our Top Pick for vitamin B-12 and the latest information about B-12 dosage and safety and when to take vitamin B-12