Pre-workout supplements usually come in powder versions, some products are available in tablet or capsules form. Timing is always about 30-45 minutes prior to training, only on training days, these are not used on off-days. The dosage requirements are typically, because of the high amount of caffeine, starting off with a small serving to assess your tolerance and you increase from there as need be to the maximum dose. Depending on how much you train, you may find yourself adjusting to the caffeine content in which case you should take a few days or even weeks off from using the product. Dosage is always product specific so, as usual, take the time and completely read the label before purchasing and your first use of your product.
Pre-workout products are designed to enhance performance when training. They are usually blends of various performance ingredients and stimulants which can help to increase strength, muscle pumps, endurance, mental focus and into various amino acids, stimulants and other ergogenic ingredients has shown that many can have positive acute effects on athletic performance when taken prior to training. See More Pre-workout formulas typically contain ingredients such as creatine, arginine, beta alanine and caffeine as all of these are well researched into their abilities to enhance performance by either increasing strength, endurance or mental focus and energy. The dosages of these ingredients can vary greatly depending on the main focus of the formula as some are designed primarily to enhance strength whilst others are designed to focus more heavily on stimulating the central nervous system.
I've has USN muscle fuel anabolic a couple of times now after switching from the hyperbolic mass. I much prefer this shake because it makes me less bloated and gives me the same amount of protein as opposed to hyperbolic. I find that it's much easier to have a 2/3 of these without feeling too bloated or sick, whereas with hyperbolic mass I found myself not wanting to eat food .
I use it mid-morning between breakfast and lunch as a snack, and then lost workout or as a mid afternoon snack if I can't get to the gym, I find that it digests really easily and I can eat all my other meals throughout the day as well so overall it's a fantastic shake and it puts size on well.