---
product_id: 581838869
title: "Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ..."
brand: "underground bio labs"
price: "$126.79"
currency: USD
in_stock: true
reviews_count: 8
category: "Underground Bio Labs"
url: https://www.desertcart.us/products/581838869-underground-bio-labs-panda-supps-skull-nootropic-pre-workout-403mg
store_origin: US
region: United States of America
---

# 403mg caffeine for explosive energy 8g L-Citrulline Malate for insane muscle pumps 600mg Alpha GPC for tunnel vision focus Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ...

**Brand:** underground bio labs
**Price:** $126.79
**Availability:** ✅ In Stock

## Summary

> 💥 Crush your limits with Skull: Focus, Energy & Pumps in one scoop!

## Quick Answers

- **What is this?** Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ... by underground bio labs
- **How much does it cost?** $126.79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/581838869-underground-bio-labs-panda-supps-skull-nootropic-pre-workout-403mg)

## Best For

- underground bio labs enthusiasts

## Why This Product

- Trusted underground bio labs brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Laser-Sharp Focus:** 600mg Alpha GPC and 3g L-Tyrosine deliver tunnel vision concentration.
- • **Endurance Amplified:** 50mg Senactiv and 500mg Lion’s Mane enhance stamina and mental clarity.
- • **Optimized Absorption:** 50mg AstraGin ensures maximum nutrient uptake for peak performance.
- • **Explosive Energy Boost:** 403mg caffeine from 3 sources powers your workout with no crash.
- • **Unmatched Muscle Pumps:** 8g L-Citrulline Malate plus 1000mg Agmatine Sulfate for vascular fullness.

## Overview

Underground Bio Labs’ Skull Pre-Workout is a high-stimulant, nootropic formula designed for professionals who demand peak mental focus, explosive energy, and intense muscle pumps. Featuring 403mg caffeine from three sources, 600mg Alpha GPC for tunnel vision, and 8g L-Citrulline Malate for vascular pumps, Skull supports endurance and absorption with clinically dosed ingredients like Lion’s Mane, Senactiv, and AstraGin. Perfect for those who want to dominate workouts with sustained energy and razor-sharp concentration.

## Description

PANDA SUPPS - SKULL Pre-Workout Behold SKULL, our all new High Stimulant Nootropic Pre-Workout the newest addition to our growing pre-workout lineup! Forged with utmost precision over an arduous span, this pre-workout transcends the boundaries of focus and nootropic pre-workouts, ascending to the realm of the extraordinary. SKULL combines pump, focus, tunnel vision, and endurance all in one pre-workout! A new chapter has been opened in the Panda Supps pre-workout lineup. SKULL Pre is a testament to the unyielding dedication of Panda Supps, forever etched in the hearts of those who seek unparalleled excellence. Skull pre-workout, with its powerful ingredients, promotes muscle endurance, helping you push through those intense training sessions with ease. Not only does it aid in energy production, giving you the sustainable fuel you need to power through your workouts, but most importantly, it supports focus and mental sharpness, allowing you to stay fully engaged and in the zone. Additionally, Skull pre-workout provides mood elevation, helping you feel motivated and ready to tackle your fitness goals. Its tunnel vision effect enables you to block out distractions and maintain unwavering concentration. What sets this pre-workout apart is its ability to reduce the perception of effort. With the added benefit of delivering amazing pumps, Skull pre-workout is undoubtedly destined to become your new favorite pre-workout supplement. Directions: SKULL should be consumed 20 minutes prior to any workout or exercise session. Depending on tolerance, start with 1/2 - 1 scoops and mix vigorously in 8 Oz of water until dissolved fully. Do NOT exceed 2 scoops.

Review: Good nootropics - Fav
Review: Skull...... - I don't like to review supps... Not everything works for everybody. I mean I have a high tolerance for stims 🤷🏾‍♂️ anyway.... THIS RIGHT HERE!!!!!! Taste great, dragonfruit is sweet not sour 👏🏾 here's the protocol PB & Rice cake first with Skull Wait for 30mins.... Tunnel vision, great energy, good pump. No crash!!!

## Features

- MENTAL PERFORMANCE: 500 MG Lion’s Mane COGNITION: 100 Mg CognatiQ
- PUMP: 1000 MG Agmatine Sulfate PUMP: 8G L-Citrulline Malate
- ENERGY: 403MG Caffeine (3 Different Sources) ABSORBTION: 50 MG AstraGin ENDURANCE: 50 MG Senactiv
- FOCUS: 3G L-Tyrosine TUNNEL VISION: 600 MG Alpha GPC

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CMJ8CS7R |
| Age Range Description | Adult |
| Best Sellers Rank | #102,332 in Health & Household ( See Top 100 in Health & Household ) #225 in Sports Nutrition Pre-Workout Powders |
| Brand | Underground Bio Labs |
| Brand Name | Underground Bio Labs |
| Customer Reviews | 4.2 out of 5 stars 27 Reviews |
| Flavor | Skull Crusher |
| Item Dimensions | 3.5 x 3.5 x 6 inches |
| Item Form | Powder |
| Item dimensions L x W x H | 3.5 x 3.5 x 6 inches |
| Manufacturer | Underground Bio Labs |
| Manufacturer Part Number | SkullPre |
| Number of Items | 1 |
| Product Benefits | Energy Management |
| Total Servings Per Container | 40 |
| UPC | 051497423186 |
| Unit Count | 14.81 Ounce |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** Underground Bio Labs
- **Flavor:** Skull Crusher
- **Item Form:** Powder
- **Item dimensions L x W x H:** 3.5 x 3.5 x 6 inches
- **Number of Items:** 1
- **Product Benefits:** Energy Management
- **Servings per Container:** 40
- **UPC:** 051497423186
- **Unit Count:** 14.81 Ounce

## Images

![Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ... - Image 1](https://m.media-amazon.com/images/I/81wDHp-Q6aL.jpg)
![Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ... - Image 2](https://m.media-amazon.com/images/I/61SPAE92VlL.jpg)
![Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ... - Image 3](https://m.media-amazon.com/images/I/81HjPeSKAxL.jpg)
![Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, ... - Image 4](https://m.media-amazon.com/images/I/81i8KPOL3IL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good nootropics
*by T***N on May 6, 2026*

Fav

### ⭐⭐⭐⭐⭐ Skull......
*by A***N on August 18, 2025*

I don't like to review supps... Not everything works for everybody. I mean I have a high tolerance for stims 🤷🏾‍♂️ anyway.... THIS RIGHT HERE!!!!!! Taste great, dragonfruit is sweet not sour 👏🏾 here's the protocol PB & Rice cake first with Skull Wait for 30mins.... Tunnel vision, great energy, good pump. No crash!!!

### ⭐⭐⭐ Ok product
*by M***S on October 3, 2025*

Good energy , just taste is not good at all . Mixes well , but price a bit high for this product . Wouldn’t recommend in my opinion.

## Frequently Bought Together

- Underground Bio Labs/Panda Supps Skull:Nootropic Pre-Workout,403mg Caffeine, Tunnel Vision Focus,Pumps, Unparalled Energy (40 Scoops) (Dragonfruit Watermelon Candy) Skull Crusher
- Underground Bio Labs Panda Supps Pump, Pre-Workout, No-Clump Formula w/10G L-Citrulline Malate, Alpha GPC, Lions Mane,CognatiQ™,VasoDrive-AP® 40 Scoops (Rainbow Dragonfruit)
- Underground Bio Labs™ Panda Supps: Rampage, Extreme Pre-Workout, High Stim, Maximum Pump, Focus, and Energy,(50 Servings) (Kiwi-Lychee-Pinapple Flavor AKA Goblin Juice)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-06-06*