Barielle Nail Strengthener Cream helps nails resist splits, peels & breaks. Use daily to maintain healthy nails and noticeable imporovements in 3-4 weeks. Barielle Nail Strengthener Cream can be used over polish. Originally created to condition the hooves of million dollar, thoroughbred racehorses, this trusted and legendary formula helps nails grow healthier and stronger while resisting splits, peels and breaks. May be used over nail enamel.