Intervits 50g Vitamins to add to the drinking water. Agrivite Chicken Lickin' InterVits are a soluble multi-vitamin, ideal for giving your poultry a boost during stressful periods such as introductions, moulting, movement and during the breeding season. Also used to boost the immune system of day-old chicks. Chartley Chucks always adds Intervits to day old chicks water for 1-2 weeks and into the water of the breeding birds to ensure they are in the peak of health for producing strong healthy hatching eggs. Dosage: 0.5g per 1litre of water.