How to Use FSO Syringe: A Complete Guide
To use an FSO syringe, warm it in a sealed bag in warm water for a few minutes to thin the oil. Then dispense a rice-grain-sized drop under your tongue, hold for 90 seconds, and swallow. Start low and go slow.
How to Use an FSO Syringe: Step-by-Step
Using an FSO syringe is straightforward once you know the technique. The syringe allows for easy dosing, but the oil is thick and needs gentle warming first.
- Warm the syringe — Place the capped syringe in a sealed plastic bag, then submerge it in a bowl of warm (not hot) water for 2–3 minutes. This thins the oil so it dispenses smoothly.
- Dispense your dose — Remove the cap, hold the syringe over a clean spoon or directly under your tongue, and slowly push the plunger to release a rice-grain-sized amount (about 0.1–0.25 mL).
- Administer sublingually — Drop the oil under your tongue and hold it there for 90 seconds without swallowing. This allows absorption through the mucous membranes.
- Swallow and wait — After 90 seconds, swallow the remaining oil. Wait at least 15 minutes before eating or drinking anything to maximize absorption.
- Store properly — Recap the syringe tightly and store it in a cool, dark place away from heat and light. Do not refrigerate unless instructed.
For a personalized protocol including medication pairing and delivery methods, we offer free consultations. Visit our RSO oil for cancer page to learn more.
FSO Syringe Dosage: How Much to Start With
Dosing FSO is highly individual. Always start low and go slow. The table below provides general starting guidelines for a typical 1-gram syringe.
| Experience Level | Starting Dose | How to Measure | Frequency |
|---|---|---|---|
| Beginner (no THC tolerance) | 0.1 mL (rice grain) | 1–2 small drops from syringe | Once daily, increase every 3–5 days |
| Moderate tolerance | 0.25 mL (half a rice grain) | 3–4 drops | Twice daily, adjust based on effects |
| Experienced user | 0.5 mL (full rice grain) | 6–8 drops | Up to 3 times daily, monitor response |
| High tolerance / medical need | 0.75–1 mL | Full syringe mark | Consult our team for protocol |
These are general ranges. Your ideal dose depends on body weight, metabolism, and the condition being addressed. We provide a customized protocol during your free consultation.
Ways to Consume FSO: Oral, Sublingual, and Topical
FSO is versatile, but not all methods are safe. Here’s a comparison of the most common ways to use it.
| Method | How It Works | Onset Time | Duration | Best For |
|---|---|---|---|---|
| Sublingual (under tongue) | Absorbed directly into bloodstream via mucous membranes | 15–30 minutes | 4–6 hours | Fast relief, precise dosing |
| Oral (swallowed) | Digested and processed by the liver | 45–90 minutes | 6–8 hours | Long-lasting effects, sleep support |
| Topical (applied to skin) | Absorbed through skin; minimal systemic effects | 30–60 minutes | 2–4 hours | Localized pain, inflammation, skin conditions |
| Rectal (via dosing syringe) | Absorbed via rectal mucosa; bypasses liver | 10–20 minutes | 4–6 hours | Nausea, digestive issues, high bioavailability |
For most users, sublingual is the recommended starting method. Our team can help you choose the best delivery method for your specific needs.
FSO vs. RSO vs. FSHO: What's the Difference?
These acronyms can be confusing. Here’s a clear breakdown.
| Term | Full Name | Extraction Method | Activation | Typical Use |
|---|---|---|---|---|
| RSO | Rick Simpson Oil | Solvent (ethanol or isopropyl) | Decarboxylated (activated) | Oral, topical, sublingual |
| FSO | Full Spectrum Oil | Solvent (ethanol) | Decarboxylated (activated) | Oral, topical, sublingual, rectal |
| FSHO | Full Spectrum Hash Oil | Solvent (butane, CO2) | Can be raw or decarbed | Dabbing, vaping, edibles |
Our FSO is made from cannabis flower (no trim) using ethanol extraction, and it is fully decarboxylated—meaning it's ready to use without further heating. Unlike FSHO, our oil is not intended for inhalation.
Can You Vape or Cook with FSO?
FSO is designed for oral and topical use only. Here’s what you should know about other methods.
| Method | Safe? | Why or Why Not | Alternative |
|---|---|---|---|
| Vaping | No | FSO contains plant lipids and residual solvents that can harm lungs | Use FSHO or distillate designed for inhalation |
| Smoking | No | Burning releases harmful byproducts; not intended for combustion | Use flower or concentrates for smoking |
| Cooking / Edibles | Yes, with care | Already activated; can be added to food, but avoid high heat | Mix into warm (not hot) foods like butter, oil, or sauces |
| Sublingual / Oral | Yes | Most effective and safest method | Stick to recommended protocol |
If you want to use FSO in edibles, stir it into a warm fat (like coconut oil or butter) after cooking, not during. For more on cooking, see our guide on [[can-you-use-rso-oil-in-edibles|using RSO oil in edibles]].
Troubleshooting: How to Get Stuck Oil Out of Your Syringe
If your FSO syringe won't dispense, don't force it. Follow these steps to get the oil flowing.
- Warm it properly — Place the capped syringe in a sealed bag and submerge in warm water (not boiling) for 3–5 minutes. This softens the oil.
- Check the tip — Sometimes a small plug of oil blocks the opening. After warming, gently squeeze a tiny bit onto a clean surface to clear it.
- Use a gentle, steady push — Apply slow, even pressure to the plunger. Avoid jerky movements that can cause the syringe to crack.
- If still stuck — Try rolling the syringe between your palms for a minute to further warm and mix the oil. Then attempt to dispense again.
- Last resort — Use a clean pin or paperclip to gently clear the tip (after warming). Be careful not to damage the syringe.
If the syringe is damaged or the oil remains stuck, contact our support team for a replacement. We offer real-time help 7 days a week via video call, phone, or text.
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Also asked as
- How do I use an RSO syringe?
- What is the correct way to use Rick Simpson Oil?
- How do you dispense FSO from a syringe?
Frequently asked questions
What is the correct way to use RSO?
The correct way is to start with a rice-grain-sized dose (about 0.1–0.25 mL) placed under your tongue, held for 90 seconds, then swallowed. Always warm the sealed syringe first to make the oil flow. Never inject or vape RSO.
How do I open an RSO syringe?
Twist off the cap at the tip of the syringe. If the cap is tight, run it under warm water for a few seconds to loosen. Do not use tools that could break the plastic.
Do you get high off distillate?
Yes, distillate contains THC and will produce psychoactive effects if consumed. The intensity depends on the dose and your tolerance. FSO is full spectrum, so it includes THC along with CBD and CBG.
Is a distillate syringe already activated?
Yes, most distillate syringes (including FSO) contain decarboxylated oil, meaning it is already activated and ready for oral or topical use without further heating.
How much is 1g of distillate?
One gram of distillate is roughly the volume of a pea or about 20–25 drops from a standard syringe. It contains approximately 600–800 mg of THC, depending on potency.