Introduction
Rick Simpson Oil (RSO) has been a the topic of discusion by many who are looking for alternative treatment for cancer inr years. Its known for its high THC content and full-spectrum composition, RSO is used by thousands of Americans looking for relief from cancer symptoms or, in some cases, people looking for anti-tumor effects.
But what does the latest U.S. research say about RSO and its role in treating cancer? On this post, we would tell you all about the recent findings from 2025, including the lab results, clinic trials, patient experience, and insights from an oncologist.
What Is RSO and Why Do Cancer Patients Use It?
RSO is a cannabis oil that was created by Rick Simpson to treat his skin cancer. It contains:
- High THC concentrations (70% or more)
- CBD, CBN, and other minor cannabinoids
- A full-spectrum profile with terpenes and flavonoids
Cancer patients mostly use RSO for:
- Pain relief
- Nausea and vomiting from chemotherapy
- Appetite stimulation
- Sleep and relaxation
- General comfort during treatment
While the claims about its anti-cancer effects have been talked about for years for years, scientific studies are finally accepting that fact.
Key U.S. Research Highlights in 2025
Recent clinical studies in the U.S. have made progress in evaluating how THC and CBD affect cancer cells and also how it affects the outcome of your treatment.
1. Tumor Inhibition Studies
A 2025 study by researchers from UCLA and the University of Michigan found out that:
- THC-rich extracts slowed tumor growth in glioblastoma cell cultures
- Cannabinoids increased apoptosis (cancer cell death)
- Inflammation levels associated with cancer progression were reduced
2. Cannabis + Chemotherapy Synergy
An NIH funded an experiment in Florida where RSO was tested alongside chemotherapy. Patients reported:
- Less nausea and vomiting
- Better appetite and energy
- More consistent with their treatment
However, the RSO was used as a supportive treatment, and not a replacement for standard one.
3. Case Studies and Oncologist Input
Case reports continued showing up saying:
- Tumor shrinkage
- Quality of life improves
- Decreased in need for opiates and anti-nausea meds
Still yet, medical experts ask everyone to be cautious, as these results are not yet supported by a large number of medical institutions.
What Medical Experts Are Saying
In 2025, more oncologists are open to conversations concerning cannabis, especially in states where medical marijuana is integrated into the medical systems. Most professional oncologists agree that:
- RSO can be a valuable supportive treatment
- It should never replace chemotherapy, radiation, or immunotherapy
- Patients should work with a cannabis-trained doctor to manage dosage and interactions
There’s a growing interest in formal certifying oncologists on cannabis, which may accelerate the process of it been accepted by many.
What Types of Cancer Are Being Studied with RSO?
Researchs are actively ongoing on how THC acts on:
- Brain cancers (e.g., glioblastoma)
- Breast and ovarian cancer
- Prostate and colorectal cancers
- Pancreatic cancer (early-phase trials)
- Blood cancers like leukemia and lymphoma
In each case, the main focus is on how it affects the tumors directly or how it manages the symptom.
How Patients Are Using RSO for Cancer in 2025
Across the U.S., patients are incorporating RSO into their treatment in the following ways:
- Traditional 60-gram/90-day protocol which was made popular by Rick Simpson
- Capsule and tincture for easier administration
- Nighttime dosing to avoid psychoactive effectsduring the day
- Microdosing to reduce anxiety or discomfort
Cancer patients frequently report that RSO helps them deal with nausea, pain, and anxiety caused by chemotherapy and radiation.
Cautions and Limitations
While the upcoming results are promising, the latest research also shows key limitations whic includes:
- RSO is not a cure, and no major U.S. trial has confirmed its anti-cancer efficacy in humans
- High amounts of THC can cause fatigue, confusion, or anxiety, especially in sensitive patients
- RSO may interact with immunotherapy or other targeted drugs
- Product quality and dosing can vary across states and suppliers
Patients are advised to use only a lab-tested, regulated RSO products and never try making it at home in other to treat their cancer.
The Future of RSO in Cancer Care
Moving forward, researchers and oncologists are anticipating that:
- FDA would registered humans to try THC extracts for cancer
- More dispensaries should offer standardized RSO capsules and tinctures for medical use
- Increased physician to research on RSO protocols
- Development of personalized dosing algorithms for cannabis and cancer
RSO is moving from an unofficial treatment into the world and integrative oncology carefully, and confidently.
Final Thoughts: Hope with Caution
RSO continues to bring hope to cancer patients looking for more than just managing their symptom . Although it’s not a substitute for the treatments in clinical, 2025 research shows that RSO may offer meaningful supportive benefits when used correctly.
If you’re considering RSO as part of your cancer care plan, speak to a cannabis-informed oncologist, follow medical advice, and only use high-quality and lab-verified products.
Ready to explore RSO products formulated for cancer symptom support? Browse our cancer-support RSO capsules and tinctures
View the NIH’s cannabis and oncology research summary here: cancer.gov