The caffeine content in pre-workout supplements can vary widely depending on the brand and specific product. Generally, pre-workout supplements contain between 150 mg to 400 mg of caffeine per serving. Some products may have more or less than this range.

It's important to check the label of the specific pre-workout supplement you are using to determine its exact caffeine content. If you're sensitive to caffeine or trying to manage your intake, you might also want to start with a lower dose to assess your tolerance.

Does pre workout break intermittent fast?

Pre-workout supplements can potentially break a fast, depending on their ingredients. Intermittent fasting typically restricts calorie intake during fasting periods, so anything that contains calories, sweeteners, or certain other ingredients might technically break a fast. Here's a breakdown of common pre-workout ingredients and their effects on fasting:

1. BCAAs (Branched-Chain Amino Acids): These often contain calories and can trigger an insulin response, breaking a fast.
2. Artificial Sweeteners: Some artificial sweeteners may cause an insulin response, although the effect is typically small. However, it can still break a strict fast.
3. Caffeine: Black coffee and caffeine alone do not contain calories and are generally considered acceptable during fasting.
4. Electrolytes: If they are calorie-free, they won't break a fast. Some supplements with added sugars or flavors might, though.
5. Other Additives: Any added sugars, protein, or carbohydrates will break a fast due to their caloric content.

If you're aiming for a strict fast, it is best to avoid pre-workout supplements during your fasting window. If your fasting goals are more flexible and primarily focused on caloric restriction, a low-calorie pre-workout may be acceptable.

Does pre workout expire?

Yes, pre-workout supplements can expire. Like most consumable products, they have a shelf life, which is usually indicated by an expiration date on the packaging. Over time, the ingredients in pre-workout supplements can degrade, potentially reducing their effectiveness and possibly leading to changes in taste, texture, and safety.

Here are some signs that your pre-workout might be expired or going bad:

1. Change in Smell or Taste: If the pre-workout smells or tastes different from when you first opened it, it might have gone bad.
2. Clumping: If the powder has clumped together, this could indicate that it has been exposed to moisture and may have degraded.
3. Change in Color: If the color of the powder has changed, it might be a sign that it has started to break down.
4. Effectiveness: If you notice that the pre-workout is not providing the same energy boost or other effects it used to, it might be past its prime.

To extend the shelf life of your pre-workout supplement, store it in a cool, dry place, and make sure the container is tightly sealed after each use.