These can be taken together as they are both considered to be safe and well-tolerated when taken as recommended. However, it's always best to consult a healthcare professional before starting any new supplement regimen, especially if you have pre-existing health conditions or are taking medications. The recommended dosages of both tongkat ali and ashwagandha can vary depending on factors such as age, weight, and intended use, and a healthcare professional can help determine the right amount for you.