Intralipid and In Vitro Fertilization (IVF)

What is Intralipid?

The success of in vitro fertilization (IVF) depends on multiple and often complex factors, one of which is the woman’s immune system. In recent years, reproductive medicine has increasingly focused on the role of immunological factors in fertility, embryo implantation, and the healthy progression of pregnancy.

Intralipid therapy is an immunomodulatory approach used in certain assisted reproduction cases, aiming to create a more favorable immune environment within the endometrium. Intralipid is an intravenous lipid emulsion that has long been used in clinical medicine for parenteral nutrition but has also gained a role in reproductive medicine due to its potential immunomodulatory effects.

More specifically, the treatment aims to reduce the overactivity of natural killer (NK) cells and promote a more balanced immune response, which may be important for successful embryo implantation and early pregnancy development.

The use of Intralipid is typically considered in women with a history of recurrent implantation failure or recurrent pregnancy loss, as well as in cases where immunological factors are suspected to interfere with the implantation process. The therapy is administered intravenously at specific stages of an IVF cycle, with the goal of supporting a more stable and receptive immunological environment for embryo implantation and the progression of pregnancy.

Composition and mode of action

Intralipid is a white, milky solution made primarily from plant-based fat particles, specifically soybean oil, egg lecithin, glycerin, and water for injection. The solution is high in polyunsaturated fatty acids, which play a significant role in regulating the body's inflammatory and immune responses.When administered intravenously, Intralipid gradually alters the cellular activity of the immune system, particularly leukocytes and NK cells. It may also affect the metabolism of prostaglandins and cytokines — molecules directly involved in inflammation, immune activation, and angiogenesis, all critical processes for fertilization and embryo implantation.

How Intralipid affects the immune system

Intralipid works by regulating the immune system’s overactivity, which may be observed in women with unexplained infertility, recurrent miscarriages, or implantation failures, even after transferring high-quality embryos. Its mechanism is linked to reducing the cytotoxic activity of NK cells, which normally play a defensive role but, when overactive, may perceive the embryo as a “foreign body” and attack it.By suppressing the excessive activation of these cells and generally balancing immune parameters, Intralipid contributes to the creation of a friendly intrauterine environment that allows for successful implantation and continuation of pregnancy. The treatment may also positively influence the balance between Th1 and Th2 lymphocytes, which is associated with the maternal immune tolerance of the embryo.

When Is Intralipid Used in IVF

Intralipid therapy is not used in all IVF cases but is a specialized approach applied mainly when there are indications that the woman’s immune system is hindering successful implantation or pregnancy progression. The precise timing and therapeutic protocol are determined based on the clinical picture, laboratory results, and patient history.

Cases where Intralipid therapy is recommended

Intralipid therapy is mainly recommended for couples who have undergone IVF or other assisted reproduction treatments without achieving a healthy pregnancy. The addition of Intralipid may be considered in cases such as:

Recurrent implantation failure (RIF)

Repeated first-trimester miscarriages, particularly when no other clear cause has been identified

Unexplained infertility, when no obvious cause is found but an immunological contribution is suspected

Confirmed high NK cell activity or abnormal Th1/Th2 ratio

Recurrent biochemical pregnancies

A fertility specialist will evaluate the couple’s medical history and diagnostic findings in order to determine whether the addition of Intralipid therapy may help improve implantation and support the healthy progression of pregnancy.

Combination with other treatments

Intralipid therapy can be incorporated into different assisted reproduction treatment protocols, most commonly in IVF/ICSI cycles. In many cases, the first infusion is administered a few days before embryo transfer, with the possibility of repeating the treatment after implantation if the pregnancy test is positive, depending on the patient’s immunological profile.

Intralipid therapy may also be combined with preimplantation genetic testing (PGT-A / PGT-M), hormonal support, or intrauterine insemination (IUI) in women with immunological factors affecting fertility, although the available clinical data are more established for IVF cycles.

In certain cases, the treatment may also be used in natural conception cycles when a significant immunological imbalance has been diagnosed. The correct timing and integration of Intralipid therapy with other treatments require clinical expertise and an individualized treatment plan, as each fertility case is unique.

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Benefits of Intralipid Therapy

The addition of Intralipid therapy to an IVF treatment protocol may offer significant benefits for women with diagnosed immunological imbalance. This therapy does not act merely as supportive treatment but targets one of the key mechanisms that may negatively affect embryo implantation and the progression of pregnancy. The potential clinical benefits of Intralipid therapy can be summarized in three main areas:

Improved implantation rates

One of the main advantages of Intralipid therapy is the potential improvement in embryo implantation rates. In IVF cycles where good-quality embryos are available but repeated implantation failures occur, immunological factors may play an important role.

The administration of Intralipid may help reduce the activity of aggressive immune cells, such as natural killer (NK) cells, and improve endometrial receptivity, making the uterine environment more supportive for embryo implantation. As a result, the chances of success may increase, particularly in women who have undergone multiple IVF attempts without achieving pregnancy.

Microscopic view of IVF egg injection, illustrating precise technique used in immunological fertility treatment.

Reduced miscarriages

Another important potential benefit of Intralipid therapy is the reduction in the risk of miscarriage, particularly in women with a history of recurrent first-trimester pregnancy loss without a clear cause.

In some cases, autoimmune reactions against the embryo due to immune system dysregulation may lead to pregnancy loss even after successful implantation. Intralipid may help regulate these immune responses, reducing the potential toxicity of the uterine environment and allowing the embryo to develop more normally during the critical early stages of pregnancy.

Happy couple proudly displays their IVF ultrasound, celebrating successful conception after immunological treatment.

Better immunological balance in the uterus

The success of pregnancy depends to a large extent on immunological balance within the endometrial environment, meaning the harmonious interaction between the maternal immune system and the developing embryo.

Intralipid may contribute to restoring this balance by reducing the overactivity of Th1 immune responses and supporting Th2 responses, which are considered more favorable for pregnancy maintenance. In addition, it may support angiogenesis and microcirculation within the endometrium, improving the nutritional support of the embryo.

Medical model demonstrating IVF procedure, highlighting how intralipid therapy supports reproductive success.

Intralipid Treatment Timeline

Intralipid therapy is incorporated into the IVF protocol as a specialized immune-regulating tool. Proper timing, duration, and location of administration are critical to its effectiveness. Below is a step-by-step breakdown of the procedure.

When the infusion is done (before and after embryo transfer)

The first Intralipid infusion is usually administered a few days before embryo transfer in order to reduce the overactivity of the immune system and prepare the endometrium for implantation. More specifically, the intravenous infusion is typically given approximately 5 to 7 days before embryo transfer.

Depending on the results of immunological tests and the progression of the pregnancy, a second Intralipid infusion may be administered after a positive beta-hCG pregnancy test, usually between the 4th and 6th week of pregnancy, in order to further stabilize the immunological environment of the uterus.

In special cases with significantly elevated immunological markers (for example very high NK cell levels), a third infusion may be administered during the early weeks of pregnancy, or the treatment may continue during the first trimester, always under the guidance of a specialized reproductive medicine physician.

How Long the Infusion Takes & Where It Is Performed

Intralipid is administered intravenously under medical supervision. The infusion procedure usually lasts approximately 60 minutes, and the patient is required to remain in a comfortable resting position during administration.

The treatment is provided in:

IVF units offering immunological support

Specialized clinics experienced in assisted reproduction

Private practices or partner diagnostic centers equipped for IV infusions

The Fertulity team ensures the coordinated scheduling of treatment to integrate smoothly into the overall IVF protocol without delays or inconvenience.

Are there side effects?

Intralipid therapy is considered safe, with a very low incidence of side effects, especially when administered under expert medical supervision. Most women experience no discomfort during or after infusion.

Possible mild side effects include:

Mild fluid retention or swelling in the limbs

Fatigue on the day of infusion

Rarely, allergic reactions (particularly in individuals with allergies to soy, nuts, or egg products)

Before starting the therapy, a detailed medical history is always taken to rule out contraindications and ensure complete safety.

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Frequently Asked Questions About Intralipid Therapy in IVF

Can Intralipid therapy be applied in natural conception cycles?

Yes, in certain cases Intralipid therapy can be applied even outside IVF, in natural conception cycles. This applies mainly to women with confirmed immune problems or a history of recurrent miscarriages. The therapy may help regulate the immune system and enhance natural implantation, but its use requires careful assessment by a specialized doctor.

Is special preparation needed before Intralipid infusion?

No special preparation is required before the Intralipid infusion, although fasting for a few hours or following doctor’s instructions may be recommended. Allergy screening (e.g., for soy or egg) is also performed, and it’s best to avoid intense physical activity on the day of treatment. Your physician may request a blood test a few days prior to evaluate your general health status.

Is there scientific evidence supporting Intralipid’s effectiveness?

Yes, there are scientific studies and publications documenting Intralipid’s immunomodulatory action and its potential positive effect on IVF success. However, the therapy is not a cure-all, and its effectiveness depends on proper patient selection. Fertulity’s trusted physicians rely on the latest research data to integrate Intralipid into IVF protocols only when strong indications are present.

Can Intralipid Therapy Be Combined with Corticosteroids or Other Immunotherapies?

In certain cases, Intralipid therapy may be combined with intrauterine PRP infusion, anticoagulant medication, or other forms of immunomodulatory treatment, such as intravenous immunoglobulin (IVIG). The purpose of these combinations is to provide additional support for embryo implantation, particularly in patients with a complex immunological profile.

The design of the treatment protocol is always individualized and requires careful coordination with the treating fertility specialist and reproductive endocrinologist, who will determine the most appropriate therapeutic approach based on the patient’s medical history and diagnostic findings.

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In an era where fertility requires knowledge, care, and substantial guidance, FertUlity is not an impersonal clinic. It is two people who look you in the eye and accompany you step by step on the journey you dream of.

Dr. Chrysostomos (Makis) Papadopoulos Obstetrician – Gynecologist, MD, PhDc, MIC I

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Dr. Chrysostomos Papadopoulos - Specialist in Infertility, Endocrinology & Menopause in Athens

Dr. Maria Oikonomou Obstetrician – Gynecologist

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FertulityThrough the Words of our Parents

100% genuine, public Google reviews.
Because every fertility journey begins with honesty and trust.

      EXCELLENT  
   Based on 12 reviews 
    
 
 
 
   
 
 
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   Μαρια 
 26 days ago
 
 
  The word "thank you" to Dr. Makis Papadopoulos is too small to describe the gratitude we feel for this man. I am pregnant after IVF, having succeeded on the first attempt, and we owe this exclusively to our doctor. First Contact & Communication: From the very first contact, he won us over with his kindness, enthusiasm and willingness to dedicate as much time as we needed. Willing to explain everything in every detail, he solved every question we had in depth — not even a professor to students would analyze them with such patience and contagiousness! Scientific Training: He is an excellent scientist, with deep knowledge of the subject, a perfectionist and focused professional who leaves absolutely nothing to chance. He designed the right treatment for us, solving every problem down to the last detail, making us feel that whatever problem arises, it is certain that it will be solved. HUMANITY & SUPPORT: The most important thing, however, is his humanity. Communication with him was Immediate and he always had as much time as you needed on the phone to solve every question. He showed a deep, real interest, embracing us not just as a doctor, but as if he were our brother. We highly recommend him to every couple starting this journey. He deserves blind trust! We thank you from the bottom of our hearts for the greatest miracle of our lives!

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   Alexandra 
 52 days ago
 
 
  I don't often write reviews, but I feel that Mr. Makis truly deserves it. From the very first moment, he made me feel safe and confident. He listened carefully to what was on my mind, answered every question I had, and explained everything in a simple way, always based on scientific data. Many times, he even sent me relevant scientific studies so that I could better understand why he was suggesting a particular approach. But what stood out to me the most was that he didn't stop at the appointment. He followed up, was genuinely interested in my progress, and was available when I needed him. This is something you rarely encounter. Fortunately, he returned to Greece. He is one of the few doctors who, beyond their knowledge, remain above all human beings. He makes you feel like he sees you as a person and not as just another incident.

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   Matina 
 69 days ago
 
 
  A big thank you to Dr. Makis Papadopoulos who supported us from day one, who checked every little detail, who explained to us every move-step, every test, every medication for the reason we were doing it and what we would achieve. With incredible experience, knowledge, a lot of patience (because we had two other failed attempts with another doctor) and trust, within 8 months he adapted the protocols for our case and we achieved the positive result and we hold in our arms a priceless diamond. Above all, a rare person, calm and always available to listen to our concerns and reassure us. I highly recommend him!

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   Eva 
 93 days ago
 
 
  Thanks to Dr Makis Papadopoulos, I am now holding my two beautiful babies in my arms! He is a true expert. Professional with a human centric approach, friendly and empathetic, always available to answer our (many many) questions. I trust Dr Makis blindly and, honestly, I cannot recommend him enough!
  
 
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   Ivy 
 100 days ago
 
 
  My experience with Dr. Makis took me from a clinical stagnation to an incredible breakthrough, highly recommend Dr. Makis! Navigating the exhausting world of IVF, you know how devastating it is to watch your protocol dosages go up while your results go down. After three intense, high-dosage cycles with a previous clinic, I was left feeling incredibly discouraged. Despite escalating medications and growth hormones, my blastocyst yield was dwindling, culminating in a heartbreaking round with zero blastocysts. I knew I needed a doctor who didn't just follow a standard script, but who truly understood the nuances of egg quality and customized protocols. That is when I found Dr. Makis. Dr. Makis completely revolutionized my treatment plan. Instead of just pushing maximum dosages, he took a highly strategic, tailored approach. The result? Quality over pure protocol size. While my previous doctors kept increasing the medication dosages (which yielded fewer or zero blastocysts), Dr. Makis completely changed the strategy. He lowered the heavy stimulation, introduced smart egg-quality support (like melatonin), changed the protocol style entirely, and achieved a 700% increase in blastocysts compared to my best previous rounds. Beyond the incredible results, Dr. Makis brings a level of expertise, precision, and reassuring care that is rare to find. He looks at you as an individual, not a statistic, and knows exactly how to pivot when traditional routes fail. If you are looking for a specialist who can turn a difficult prognosis into an overwhelming success, look no further than Dr. Makis. I am incredibly grateful for his care.
  
 
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   Olga 
 111 days ago
 
 
  Dr. Makis Papadopoulos was excellent, professional, and very reassuring throughout the entire process. Thanks to his expertise and guidance, we were able to identify the issue early and take the appropriate steps from the beginning. He took the time to explain everything clearly, answered all our questions with patience, and made us feel comfortable and confident throughout our journey. We truly appreciated his caring approach, professionalism, and dedication. Highly recommended!
  
 
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   Euaggelia 
 122 days ago
 
 
  Dr. Makis Papadopoulos is an excellent scientist and above all a rare person! He is an approachable and smiling doctor, with excellent medical knowledge, who from the first moment I met him made me feel comfortable and trust him completely, answering every question I had with patience and documenting every answer with scientific studies and articles! The most important thing, however, is that Dr. Makis Papadopoulos is always there on the other end of the line to listen to you and reassure you without a trace of haste, a doctor who truly cares and makes you feel like he is your own person! Makis, thank you very much for everything!!! I am very lucky to have met you!

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   Anastasia 
 129 days ago
 
 
  Dr. Makis Papadopoulos is an excellent scientist with a human-centered interest. Our collaboration was excellent from the very beginning and he made me feel confident and secure by explaining every step of the process in great detail. I highly recommend him!

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   Fay 
 131 days ago
 
 
  Dr Makis Papadopoulos is very professional, caring and attentive. Very thorough in explaining the whole process throughout every step. Thank you! Highly recommended!!
  
 
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   Christina 
 134 days ago
 
 
  I would like to share my experience with Dr. Makis Papadopoulos, an outstanding gynecologist and scientist. We first connected in the summer of 2024, while he was based in Germany, through a mutual acquaintance, following a particularly challenging period for us. Prior to meeting him, we had gone through repeated unsuccessful attempts of stimulation and fertilization with other gynecologists. Unfortunately, those approaches relied largely on standardized protocols, without sufficient personalization to address the specific needs of my case. From the very beginning, Dr. Makis stood out for his human-centered approach and his willingness to dedicate time to truly understand our situation in depth. With strong, up-to-date scientific knowledge, he approaches every case holistically, focusing on individualized treatment and adapting protocols to the patient's unique needs. Throughout our collaboration, which now spans approximately two years (with a few breaks on our side), he has consistently been available, supportive, and clear in his guidance. He inspired confidence and helped us stay positive even during difficult phases of the journey. Beyond his scientific expertise, what truly sets him apart is his genuine care for the person behind each case: his empathy, honesty, and continuous effort to achieve the best possible outcome. My husband and I are deeply grateful for his support and guidance, and we now feel ready and optimistic to move forward to the next final stage. We highly recommend him to anyone seeking a gynecologist with true expertise, professionalism, and compassion. I would like to share my experience with Dr. Makis Papadopoulos, an excellent gynecologist and scientist. We met in the summer of 2024, when he was in Germany, through a mutual acquaintance, after a particularly demanding period for us. Before meeting him, we had gone through repeated failed attempts at stimulation and fertilization with other gynecologists. Unfortunately, the approaches that had been followed were mainly based on standardized protocols, without the necessary individualization to the specifics of my case. From the beginning, Dr. Makis stood out for his human approach and his willingness to spend time to understand our case in depth. With modern knowledge and scientific training, he approaches each issue multidimensionally, emphasizing the individualization of treatment and adapting the protocols to the real needs of the patient. During our collaboration, which now spans about two years (with short breaks on our part), he was always available, supportive and clear in his guidance. He inspired confidence in us and helped us remain optimistic even in difficult phases. In addition to his scientific competence, what sets him apart is his genuine interest in the person behind each case: his empathy, his honesty and his constant effort to achieve the best possible outcome. My husband and I thank him warmly for his support and guidance and we now feel ready and optimistic to move on to the next final stage. We highly recommend him to anyone looking for a gynecologist with real knowledge, professionalism and humanity.

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   Faidra 
 135 days ago
 
 
  Dr. Makis Papadopoulos is an excellent gynecologist and above all an excellent person! I truly thank him for his support and care during the egg freezing process. Although my case was particularly demanding, he stood by me with patience, knowledge, great experience and real interest. Our communication was direct and human, while his availability at the many appointments made me feel safe at every step. The protocols were designed specifically for me, aiming for the best possible result, while also taking into account the cost of the medications. I recommend him with all my heart to every woman who wants to trust someone for something so important and sensitive for her.

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   Iliana 
 137 days ago
 
 
  I highly recommend Dr. Makis, he is an incredible specialist. My journey was far from easy, encountering several challenges that  made the process feel overwhelming at times. What sets him apart is his willingness to go beyond standard procedures. He developed a specialized, custom protocol, tailored to my situation, which ultimately made all the difference. Beyond his technical expertise, his calm and clear communication kept me grounded throughout the process. I am so grateful for his persistence and high level of care!

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