Repeated IVF Failures: When the Problem May Be Cellular, Not Hormonal

When a couple goes through several in vitro fertilization (IVF) treatments without achieving the expected outcome, one of the first questions is often:

What is going wrong?

For many years, the answer almost always centered on hormones.

It made sense.

Hormones regulate ovulation, follicle maturation, and much of the female reproductive system’s function.

However, reproductive medicine has evolved significantly over the past few decades.

Today, we know that some patients have normal hormone test results, respond well to ovarian stimulation, produce several eggs, and even achieve fertilization… yet embryo development continues to stop before reaching the blastocyst stage or before implantation occurs.

In these cases, a new question arises:

What if the problem isn’t only hormonal?

An increasing number of studies suggest that, in addition to hormonal balance, the cellular health of the egg plays a fundamental role in reproductive potential.

Understanding this difference represents one of the most important advances in modern assisted reproduction.

Hormones Are Still Important

Talking about cellular biology does not mean that hormones are no longer relevant.

Quite the opposite.

Hormones such as:

• FSH.
• LH.
• Estradiol.
• Progesterone.
• Anti-Müllerian hormone (AMH).

Remain essential for evaluating ovarian function and planning an in vitro fertilization treatment.

They provide valuable information about:

• Ovarian reserve.
• Expected response to ovarian stimulation.
• The appropriate timing for egg retrieval.
• Follicular development.

However, these tests do not reveal everything that is happening inside the egg.

And that is precisely where an important part of the story begins.

An Egg Can Respond to Hormones… Yet Still Face Cellular Challenges

One of the most important concepts in modern reproductive medicine is that hormonal response and egg quality do not always go hand in hand.

It is possible to observe patients who:

• Have healthy hormone levels.
• Develop multiple follicles.
• Retrieve an adequate number of eggs.
• Achieve successful fertilization.

And yet still experience:

• Few blastocysts.
• Slow embryo development.
• Embryo developmental arrest.
• Embryos that stop dividing.

This happens because egg quality also depends on biological processes that cannot be evaluated through hormone testing alone.

The Egg Contributes Much More Than Genetic Information

When fertilization occurs, the sperm contributes half of the DNA.

However, the egg contributes much more than the other half of the genetic material.

It also provides:

• Mitochondria.
• Cytoplasm.
• Messenger RNA.
• Proteins.
• Regulatory factors.
• Energy reserves.

During the first days of embryo development, the embryo depends almost entirely on these resources.

For this reason, the functional state of the egg can directly influence the embryo’s developmental potential.

Cellular Energy: An Essential Resource

After fertilization, the embryo begins a continuous process of cell division.

Each new division requires an enormous amount of energy.

This energy is produced primarily by the mitochondria through ATP generation.

ATP is involved in essential processes such as:

• Cellular organization.
• DNA repair.
• Protein synthesis.
• Communication between cells.
• Embryonic genome activation.

When energy production declines, the embryo may face greater difficulty sustaining its development.

For this reason, mitochondrial function has become one of the leading areas of research in assisted reproduction.

What Happens When Development Stops?

One of the most common scenarios after several IVF cycles is seeing embryos begin to develop but stop dividing before reaching the blastocyst stage.

This phenomenon may be associated with multiple factors, including:

• Chromosomal abnormalities.
• Sperm quality.
• Mitochondrial function.
• Cellular integrity.
• Oxidative stress.
• The egg’s metabolic state.

It is important to remember that there is no single explanation for every case.

Each patient presents a unique combination of biological factors.

The Importance of Embryonic Genome Activation

During the first few days, the embryo primarily relies on the resources stored within the egg.

However, around the third day, a critical event occurs.

The embryo begins activating its own genome.

To complete this transition successfully, it requires:

• Sufficient energy.
• Proper cellular organization.
• Genetic integrity.
• Effective molecular communication.

When any of these processes experience significant alterations, development may stop before the blastocyst stage.

Cellular Health Is Also Part of the Diagnosis

Traditionally, fertility evaluations focused on factors such as:

• Age.
• Hormone testing.
• Ovarian reserve.
• Sperm quality.
• Embryo morphology.

Today, in addition to these parameters, research increasingly considers aspects related to cellular biology.

These include:

• Cellular energy production.
• Mitochondrial function.
• Oxidative stress.
• Cellular metabolism.
• Cytoplasmic integrity.

These processes help explain why some treatments evolve differently, even when conventional evaluations appear favorable.

Assisted Reproduction Has Shifted Its Perspective

Twenty years ago, much of the focus was on retrieving the highest possible number of eggs.

Today, research is asking a different question:

What is happening inside those eggs?

This new perspective recognizes that quantity does not always reflect quality.

A high number of eggs does not necessarily guarantee more blastocysts or better reproductive outcomes.

For this reason, modern reproductive medicine has begun placing greater emphasis on the cellular processes that support embryo development.

IVF MORE®’s Approach: Understanding Biology Before the Outcome

IVF MORE® (Magnetic Ovulatory Restoration) emerged from this scientific evolution.

Its approach seeks to understand and support the cellular health of the egg even before fertilization.

To accomplish this, it focuses on aspects related to:

• Mitochondrial function.
• Cellular energy production.
• Egg metabolism.
• Cytoplasmic integrity.
• Oxidative balance.

Its approach is based on a simple concept:

If the embryo initially depends on the resources provided by the egg, strengthening that biological foundation may help create more favorable conditions for its development.

What Happens When Every Test Appears Normal?

One of the most frustrating situations for many patients occurs when results show:

• Normal hormone levels.
• A good ovarian response.
• Successful fertilization.
• No laboratory issues.

And yet the embryos still do not develop as expected.

In these cases, understanding cellular biology offers an additional perspective.

It does not mean there is a single answer, but it does broaden our understanding of the many factors involved in embryo development.

Conclusion

Hormones remain an essential part of assisted reproduction.

However, today we know they do not fully explain every outcome obtained during an in vitro fertilization treatment.

Egg quality also depends on cellular processes related to energy production, mitochondrial function, metabolism, cytoplasmic integrity, and oxidative balance.

These factors are involved long before fertilization occurs and continue to support the embryo during its earliest cell divisions.

For this reason, modern reproductive medicine has expanded its focus toward a deeper understanding of egg biology.

IVF MORE® embraces this perspective by focusing on the cellular processes that support embryo development from its very beginning, seeking to strengthen the biological conditions that support the egg before fertilization.

If you have gone through several in vitro fertilization treatments without achieving the expected results, understanding the cellular factors involved in embryo development may offer a new perspective on your fertility journey.

Discover how IVF MORE® approaches fertility through cellular biology to better understand and support egg quality beyond hormonal balance.