Muscle Rage King Test is a testosterone booster that backs natural testosterone production and steady male vitality, thanks to a high potency mix of proven ingredients. [which reflects our commitment to quality and real, everyday benefits].

Available Sizes & Variants:

300 capsules - generous daily supply for ongoing support.

Benefits & Features:

• Boosts natural testosterone production to support energy and vitality.
• Vitamin D3 supports testosterone synthesis and helps maintain mood and energy.
• D-Aspartic acid stimulates LH and testosterone release, supporting peak performance.
• Ashwagandha (KSM-66) supports stress resilience, promotes recovery after workouts and, paired with the other ingredients, helps you stay focused, push harder and feel steadier day to day.
• Black Pepper Extract enhances absorption, helping the other ingredients work more effectively.

King Test comes from a brand with a clear focus on male vitality and everyday performance. The formula uses a fully disclosed blend of evidence backed ingredients in clinically relevant doses, designed for high bioavailability. Daily servings combine Vitamin D3, D-Aspartic Acid, Maca Root, Prolensis, KSM-66 Ashwagandha and Black Pepper to support energy, mood and stamina. There are no proprietary blends, reflecting a commitment to transparency.

Vitamin D3 (as cholecalciferol), D-Aspartic Acid, Maca Root Extract, Prolensis, KSM-66, Black Pepper Extract (Standard 95% Piperine). Microcrystalline Cellulose (MCC), Gelatin (Caps)

• GTIN: 5060559430142
• Manufacturer: Muscle Rage
• Categories: Bodybuilding SupplementsMen's Health Vitamins & SupplementsNew ArrivalsNew In Supplements & VitaminsSports Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Please consult the product packaging for accurate instructions on how to use the product.

This essential ingredient is: Vitamin D3 (Cholecalciferol)

Vitamin D3 is a fat soluble vitamin involved in key physiological processes, including helping with normal testosterone synthesis and bone and immune health.

This form is known as cholecalciferol and is widely recognised for its bioavailability and part in maintaining normal bodily functions.

What Does Vitamin D3 Do?

Vitamin D3 helps regulate calcium absorption, which supports healthy bones, and it also helps immune system function in line with NHS and EFSA guidance.

Dr. Johanning from the University found that Vitamin D3 supplementation can increase testosterone in deficient men, reflecting its role in hormonal balance.

ALLERGY ALERT: Contains Milk

Muscle Rage is our go-to partner for King Test because their production ethos revolves around quality, openness and delivering effective nutrition. The brand's formulation method leans into high potency, openly disclosed ingredient dosing meant for simplicity and dependability in daily use, so you know exactly what you're taking. This transparency matches Welzo's pledge for safe, well-built supplements and backs our aim of reliable day-to-day nutrition.

Muscle Rage has earned recognition for its strong formulation standards and evidence‑based ingredient choices, including a blend that targets energy, vitality and hormonal balance without unwieldy complexity. Our team has checked the brand for consistency, reliability and safety through our vetting process, and we emphasise how their products are assembled to maximise absorption and synergy. This is complemented by third‑party validation via our internal quality review and ongoing oversight from our medical team, which you can explore here our medical team.

We picked Muscle Rage because the product‑specific fit—a clear, potent blend with proven components—pairs nicely with Welzo's quality standards and really thorough ingredient evaluation, explained further at how we verify ingredient quality.