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If you suspect a deficiency, consult your healthcare provider

Typically, you would use it in cycles of 4-6 weeks, which gives your body enough time to recover and grow

For at-home devices, be conservative: avoid applying strong actives immediately after needling

When to Actually Be Concerned Genuine allergic reactions to any topical product, including redness with swelling, hives, blistering, or breathing difficulty, warrant stopping the product immediately and seeking medical attention

Any vision decline is of concern, and you should visit an optometrist before assuming your blurry vision is due to a vitamin deficiency

Association of vitamin B status with risk of dementia in cohort studies: a systematic review and meta-analysis