StimuMAX Extreme includes 30 scoops, 1 scoop is considered 1 serve.

A common response we get in stores from the bro lifters is "oh I never use anything less than 400mg caffeine". While everyone should have the freedom to make their own choices, for most trainers the blind pursuit of higher and higher caffeine doses is misguided, and often counterproductive. Like many compounds, caffeine has a productivity curve where you will find a peak range of usefulness, and above that will increase likelihood of side effects such as lack of focus, heart palpitations, excessively high blood pressure, or dizziness. It's important to see caffeine as not the only option for stimulation, but one tool of many. This is why the StimuMAX range looks to leverage other ingredients as complimenting sources of stimulation (the Juglans regia and Keglia africans), or ingredients that support the caffeine's function (acetyl-l-tyrosine, enXtra, juniper berry, bitter orange).
​Don't believe us? StimuMAX Extreme is also available in single serve sample packs, grab one and try it - you'll see it more than meets your needs.

The tingling sensation (known as "parethesia") is a normal effect for persons new to supplementing with the ingredient "beta alanine". Important to note, long-term high dose beta alanine supplementation has been ruled as safe by major sporting bodies such as theISSN, and beta alanine is a naturally occurring amino acid already present in the human body throughout all tissues.
The beta alanine induced parethesia occurs because beta alanine activates certain G-protein receptors, which in turn cause the firing of neurons that signal for skin sensations. These receptors are those usually responsible for signalling other feeling of sensation, those particularly sensitive to beta alanine are those who also have roles in heat sensation.
Some individuals are more responsive than others, and even some people will never feel the sensation. However because the parethesia is not responsible for the primary benefits of beta alanine, those that do not feel the sensation aren't missing out either. 
If you find the sensation uncomfortable, be assured it does settle with an hour, usually within 15-30 minutes. Most people also find that when they're training the sensation decreases, or if they consume the preworkout with food to slow down the rate of absorption.

Piperine is an ingredient often touted for "improved absorption" of other ingredients, however this description is not entirely accurate. More specifically piperine is a compound which decreases the metabolism (breakdown) of many compounds, mostly via inhibition methylation and glucuronidation enzymes. This is an especially valuable function for ingredients such as curcumin (as in SupportMAX Joint), but in the case of caffeine and many stimulants this has an effect of extending the activity so long as to compromise sleep. Generally a training session will range from 45 minutes to 3 hours depending on the athlete, of which the period of action of the stimulants in StimuMAX are well suited too and making them last longer increases the risk of side effects or sleep issues. The intent of any StimuMAX is to train with intent, then allow you to go about the rest of your day or evening with minimal jitters or crash.
In the event that you do want a piperine based extension of stimulant function, you can consider stacking your StimuMAX alongside "MAXimise" which includes Piperine, AstraGin, and Ginger extract.