Package: 1 vial (300mg/ml 10 ml)

Active Substance: Boldenone Undecylenate

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Boldaxyl 300, also known by its generic name Boldenone Undecylenate, is an injectable anabolic steroid produced by Kalpa Pharmaceuticals. This drug is primarily indicated for veterinary use to promote weight gain, improve feed efficiency, and enhance overall muscle growth in animals. However, it has gained popularity among bodybuilders and athletes for its muscle-building properties. Boldenone Undecylenate is used off-label by athletes to increase lean muscle mass, improve strength, and enhance physical performance. Its slow-acting nature makes it suitable for longer cycles, providing steady and sustainable muscle gains.


Despite its effectiveness, Boldaxyl 300 is not suitable for everyone. Contra-indications include:

  1. Pregnancy and Breastfeeding: Boldenone Undecylenate should not be used by pregnant or breastfeeding women due to potential harm to the fetus or infant.
  2. Prostate Cancer: Men with prostate cancer should avoid using Boldenone Undecylenate, as it may exacerbate the condition.
  3. Breast Cancer: Men with breast cancer should not use this drug because it can stimulate the growth of cancer cells.
  4. Severe Liver Disease: Individuals with significant liver impairment should avoid Boldenone Undecylenate because it is metabolized in the liver and can cause hepatotoxicity.
  5. Allergic Reactions: Anyone who has had an allergic reaction to Boldenone Undecylenate or any of its components should not use this drug.
  6. Cardiovascular Issues: Individuals with severe cardiovascular diseases should avoid using Boldenone Undecylenate due to its potential to worsen these conditions.


Proper administration of Boldaxyl 300 is essential to achieve the desired muscle growth and performance enhancement effects while minimizing potential risks. The recommended guidelines include:

  1. Dosage: For muscle mass gain, the typical dosage for men ranges from 200 mg to 600 mg per week. Women usually take a lower dosage, around 50 mg to 150 mg per week, to avoid virilization effects. It is essential to start with a lower dose to assess tolerance.
  2. Cycle Length: Boldenone Undecylenate cycles typically last between 10 to 12 weeks. Due to its long half-life, it is not recommended for shorter cycles.
  3. Injection Site: Boldaxyl 300 should be administered via intramuscular injection, preferably in large muscle groups such as the glutes or thighs.
  4. Frequency: Due to its long half-life, Boldenone Undecylenate can be injected once or twice a week to maintain stable blood levels.
  5. Stacking: Boldenone Undecylenate can be stacked with other anabolic steroids such as testosterone or trenbolone to enhance muscle-building effects. However, stacking should be done cautiously and under professional guidance to avoid adverse effects.

Medical Action

Boldenone Undecylenate works through several mechanisms to promote muscle growth and enhance athletic performance:

  1. Anabolic Effects: Boldenone Undecylenate has a strong anabolic effect, which means it promotes protein synthesis and nitrogen retention in muscles. This leads to increased muscle mass and strength.
  2. Androgenic Effects: While it has androgenic properties, these are relatively mild compared to other anabolic steroids. This makes it suitable for users who want to avoid significant androgenic side effects.
  3. Red Blood Cell Production: Boldenone Undecylenate stimulates the production of red blood cells, which improves oxygen delivery to muscles during workouts, enhancing endurance and recovery.
  4. Appetite Stimulation: It helps increase appetite, which can be beneficial for individuals looking to consume more calories and nutrients to support muscle growth.
  5. Collagen Synthesis: Boldenone Undecylenate promotes collagen synthesis, which supports joint and connective tissue health, reducing the risk of injuries during intense training.


Using Boldaxyl 300 requires adherence to several precautions to ensure safe and effective use:

  1. Regular Monitoring: Regular blood tests to monitor liver function, cholesterol levels, and hormone levels are essential to avoid potential complications.
  2. Liver Health: Since Boldenone Undecylenate is hepatotoxic, users should avoid alcohol and other substances that can further strain the liver. Taking liver support supplements like milk thistle can be beneficial.
  3. Cholesterol Levels: Boldenone Undecylenate can negatively impact cholesterol levels, so maintaining a heart-healthy diet rich in omega-3 fatty acids is important.
  4. Prostate Health: Regular prostate exams are advised for men, particularly older individuals, to monitor for any potential prostate-related issues.
  5. Hydration: Staying well-hydrated is important to support overall health and minimize the risk of muscle cramps and kidney strain.
  6. Individual Response: Users should start with a lower dose to assess individual tolerance and response to the drug.

Side Effects

While Boldaxyl 300 is effective for muscle growth, it can cause side effects ranging from mild to severe:

Common Side Effects

  1. Acne: Increased androgen levels can lead to acne breakouts.
  2. Hair Loss: Men predisposed to male pattern baldness may experience accelerated hair loss.
  3. Mood Changes: Some users may experience mood swings, aggression, or irritability.
  4. Oily Skin: Androgenic effects can lead to increased oil production in the skin.
  5. Joint Pain: Some users report joint pain or discomfort, which can be due to the drying effect of Boldenone Undecylenate on the joints.

Severe Side Effects

  1. Liver Toxicity: Prolonged use or high doses can lead to liver damage, including liver tumors or hepatitis.
  2. Cardiovascular Issues: Boldenone Undecylenate can negatively affect cholesterol levels, increasing the risk of cardiovascular diseases such as heart attacks or strokes.
  3. Suppression of Natural Testosterone: Long-term use can suppress natural testosterone production, leading to hormonal imbalances and requiring Post Cycle Therapy (PCT).
  4. Gynecomastia: Improper use can lead to the development of gynecomastia, which is the enlargement of male breast tissue.
  5. Hypertension: Increased blood pressure can occur, necessitating regular monitoring and management.


In the case of an overdose, immediate medical attention is necessary. Symptoms of Boldenone Undecylenate overdose may include:

  1. Severe Nausea and Vomiting: Excessive intake can cause severe gastrointestinal distress.
  2. Dizziness and Fainting: Overdosage can lead to extreme dizziness and potential fainting spells.
  3. Breathing Difficulties: Respiratory issues may arise in severe cases.
  4. Liver Damage: Overdose can exacerbate liver toxicity, leading to serious liver conditions.

Treatment for overdosage is supportive and symptomatic, focusing on stabilizing the patient and addressing specific symptoms. There is no specific antidote for Boldenone Undecylenate overdose.


Boldaxyl 300 from Kalpa Pharmaceuticals, also known as Boldenone Undecylenate, is a potent injectable anabolic steroid that offers significant benefits for muscle growth and athletic performance enhancement. Its strong anabolic properties, combined with relatively mild androgenic effects, make it a popular choice among bodybuilders and athletes. By promoting protein synthesis, nitrogen retention, and red blood cell production, Boldenone Undecylenate helps users achieve increased muscle mass, strength, and endurance.

However, the use of Boldaxyl 300 requires careful consideration of its contra-indications, potential side effects, and necessary precautions. Proper administration, including dosage management and regular health monitoring, is crucial to maximizing its benefits and minimizing risks. Regular health check-ups, a balanced diet, and liver support supplements can help users safely harness the advantages of Boldenone Undecylenate while mitigating associated risks. By adhering to these guidelines, individuals can effectively use Boldaxyl 300 to support their bodybuilding goals and maintain overall health and well-being.


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