Bird supplements live in the same category as many pet products — easy to market, easy to overbuy, and often treated as more important than they are. Sometimes they help. Sometimes they are extra clutter around a problem that should have been solved with better diet and care.
Before buying supplements, work through the basics first. Most of what supplements are expected to do is already covered — better — by a strong daily routine.
A bird eating a balanced pellet diet with a reasonable variety of fresh foods is unlikely to need most common supplements. A bird eating primarily seed is more likely to have real nutritional gaps — but the solution to that is usually better food, not supplementation on top of poor food.
Supplements add to what is already there. They work best when the foundation is already strong.
Supplements can help, but they are rarely the first thing to optimise. Get the diet, environment, and daily care right first. Then decide whether a supplement is genuinely solving a real problem or just adding another product to the routine.
Species-specific supplement guidance for cockatiels.
The general principles of good grooming for pet birds.
What to have ready before something unexpected happens.
Daily and weekly cleaning routines that support good health.