It is a high-potency product, which is recommended: either in cases where a rapid improvement in the intake of B vitamins is required, or in people with high needs for B vitamins, or in people who have been following a diet deficient in B vitamins for a long time. In the majority of cases, this product is recommended to be taken for a short period of time (approximately 2 months), after which B-50 Complex can be administered as a maintenance dose. PRECAUTIONS & SIDE EFFECTS: Allergies: None. Precautions: Taking the vitamin B complex may cause yellow discoloration of the urine. This is harmless and indicates the elimination of excess vitamin B2 (riboflavin) from the body. This product should not be taken by pregnant or breastfeeding women. Long-term intake of Vitamin B6 (100mg/day) may lead to numbness (numbness) in the extremities.