This page is a comparison between the pre-workout supplements Peri-Rx with Caffeine and Tier 1 Plus. The tables below display a side by side comparison allowing you to make a more informed decision on which product is more effective. The simple report at the top of the page is a quick and easy way to gauge product effectiveness. For more information, scroll down to the detailed report.

Simple Report

Products are graded and compared against each other in eight areas. A green check mark is placed under the product that scores higher in each category. An equal sign is shown in the event that both products are equal in one or more categories.

Peri-Rx with Caffeine Tier 1 Plus
Effectiveness Rating
Transparency Score
Effective Ingredients
Ineffective Ingredients
Effective Claims
Ineffective Claims
Research Rating
Ranking Within Category
Total Score 5 2

The final score is 5 - 2 in favor of Peri-Rx with Caffeine. To get a more detailed report on how each product is rated and which one is better tailored to fit your needs, scroll below to the detailed report.

Detailed Report

The effectiveness rating is an overall measure of how well a product works. This rating is a 3-point scale and is based on what peer reviewed research articles conclude about the ingredients found in a product. A rating equal to or greater than 2.5 means the product is extremely effective. A rating between 1.5 and 2.5 means the product is moderately effective. A rating equal to or less than 1.5 means the product is ineffective. This rating is a direct measure of whether or not a product does what it claims. Avoid products with ratings equal to or less than 1.5.

The transparency score is a percentage reflecting how many of a product's ingredients are listed with amounts on the nutrition label. Often, manufacturers create proprietary blends of ingredients which hide amounts under the guise of meaningless phrases. Avoid products that do not list 100% of their ingredient amounts.

Product ingredients are individually rated based on research from peer reviewed journal articles. The number of extremely effective, moderately effective, and ineffective ingredients illustrates what type of ingredients are found in the product. High quality products are those with a high amount of extremely effective ingredients combined with no ineffective ingredients. Avoid products with a high amount of ineffective ingredients.

Each ingredient has been tested on a number of different claims. A product can be effective or ineffective at certain claims based on its mix of ingredients. The number of effective and ineffective claims of a product illustrates how well a product is at doing what it advertises. Chose products with more effective claims and avoid ones with large numbers of ineffective claims.

A product's effectiveness rating comes from research on its ingredients. The research rating is a measure of how much research the database contains on a product's ingredients. A score below 60 indicates not enough research has been conducted on a product's ingredients to truly know whether those ingredients are effective. Scores above 60 are better. Scores above 60 are better while scores above 80 indicate the ingredients chosen by the manufacturer have adequate research backing their use.

All products are ranked against each other. The ranking within category displays how the product ranks against its competition. Choose products ranked highly while avoiding products ranked at the bottom.

Overview Peri-Rx with Caffeine Tier 1 Plus
Manufacturer Barbell Medicine Citadel Nutrition
Product Category Pre-Workout Supplements Pre-Workout Supplements
Effectiveness Rating
2.01 out of 3

1.83 out of 3
Transparency Score 100% 100%
Serving Size 1 scoop 1 scoop (12.900g)
Extremely Effective Ingredients 1 0
Moderately Effective Ingredients 7 3
Ineffective Ingredients 0 1
Effective Claims 25 21
Ineffective Claims 6 3
Research Rating

Ranking Within Category 1 out of 722 3 out of 722


This section compares the ingredients and amounts found in both products. Products with a transparency score under 100% do not have amounts for all ingredients listed on their labels.

The green check is shown next to an ingredient when it is both found in a product and its amount is shown on the nutrition label.

The orange exclamation mark is shown next to an ingredient when it is found in a product but its amount is not shown on the nutrition label.

The red X is shown next to ingredients that are not found in a product.

The rating displayed under each ingredient shows the effectiveness of that individual ingredient. You can click on the ingredient for more information.

This symbol is shown under ingredients not included in the supplement database; this means that particular ingredient does not have an effectiveness rating.

Ingredient Peri-Rx with Caffeine Tier 1 Plus
Beta Alanine
3.200g 3.200g
Branched Chain Amino Acids
300.000mg 300.000mg
Citrulline Malate
Creatine Monohydrate
2.500g 5.000g


Products are made from a mix of ingredients. There is evidence either proving or disproving claims for each ingredient. Some ingredients might be good at increasing muscle mass while at the same time being bad at improving cardiovascular endurance. This section compares what each product is capable of based on the ingredients it is made up of.

The claim-effectiveness ratings below are based on the mix of ingredients found in both products. Star ratings illustrate how well a product performs the claim.

A red X represents a claim that the product has not been tested on; there is no research in the supplement database showing the product does or does not perform the claim. This is different than a product being ineffective at a certain claim. The red X means we do not know if a product can perform a claim.

Difference between and : These symbols have different meanings. Through research, some ingredients have been found to be useless on certain claims. For example, if the research shows ingredient Y cannot decrease body fat, you will see empty star ratings. If there is no research available on ingredient Y and decreasing body fat, you will see a red X.

Claim Peri-Rx with Caffeine Tier 1 Plus
Decrease Body Fat
Decrease Cortisol Levels
Decrease Fatigue
Decrease Protein Breakdown
Improve Agility
Improve Cardiovascular Endurance
Improve Cognitive Ability
Improve Cycling Performance
Improve Cycling Sprint Performance
Improve Focus
Improve High-intensity Interval Training (HIIT) Performance
Improve Insulin Sensitivity
Improve Memory
Improve Mood
Improve Muscular Endurance
Improve Recovery
Improve Rowing Performance
Improve Running Performance
Improve Sports Performance
Improve Sprint Performance
Improve Swimming Performance
Increase Alertness
Increase Levels Of Growth Hormone
Increase Muscle Mass
Increase Protein Synthesis
Increase Pump (muscle Swelling)
Increase Strength
Increase Testosterone
Maintain Muscle Mass During Weight Loss
Reduce Muscle Damage
Reduce Muscle Soreness