There are several nootropics that have been shown to improve cognitive performance with minimal drawbacks. Here are a few:

1. Caffeine: Caffeine is a natural stimulant that can enhance focus, concentration, and mental alertness.

2. L-theanine: L-theanine is an amino acid found in tea that can reduce stress and anxiety, promote relaxation, and improve cognitive performance.

3. Bacopa Monnieri: Bacopa Monnieri is an herb that has been shown to improve memory and cognitive function.

4. Creatine: Creatine is a popular supplement that can enhance cognitive performance, especially in tasks that require quick thinking and short-term memory.

5. Rhodiola Rosea: Rhodiola Rosea is an herbal adaptogen that can help reduce stress and fatigue, boost mental clarity, and improve memory and learning abilities.

6. Ashwagandha: Ashwagandha is an adaptogenic herb that can improve cognitive function, reduce anxiety and stress, and enhance immune function.

It is always important to consult with a healthcare professional before taking any new supplements or medications. Additionally, individual results may vary and it's important to be aware of any potential side effects or interactions with other medications.
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