It is difficult to recommend a safe and effective dose of guarana. The active ingredient in guarana is actually caffeine, and the maximum safe dosage depends on several factors, including:
- The caffeine content in your particular guarana product
- How much caffeine you consume from other sources
- How you respond to caffeine (some people can take more than others).
More importantly, there is significant variation in how people react to caffeine. Some can drink several cups of coffee without any problems. For others, just a little caffeine can cause heart palpitations. If you do not react well to caffeine, you will not react well to guarana.
Children, pregnant or breastfeeding women, and people with heart problems are often advised to limit their caffeine intake. It is important to remember than any product that contains guarana contains a significant amount of caffeine.