Is it safe to use the Extra Strength Acne Control Vitamins when breastfeeding? SkinB5 Help Centre (HQ) May 31, 2019 23:03 Follow SkinB5 is a nutritional formulation. Extra Strength Acne Control Vitamins are safe to take when breastfeeding. As always, please check with your doctor before using. Have more questions? Submit a request 0 Comments Please sign in to leave a comment.