With the supplementary feed NEKTON-S, the bird owner has a preparation at his disposal that, with its high content of vitamins, amino acids and minerals, is tailored to the special needs of the birds and prevents damage to the health of the animals that can result from a lack of these active ingredients. The high-quality ingredients not only supplement the absorption and utilization of the nutrients taken in with the feed, but also improve and thus enhance them. This strengthens the bird's defenses and improves performance. At times when stress arises for the bird, for example through relocation, new arrivals, breeding, moulting, etc. the dose of NEKTON-S can be adapted to the changed situation and temporarily increased or even doubled without any problems. 6,600,000 IU vitamin A, 10,000 I.