In short: The outcome of IVF is not decided only in the laboratory. The two to three months before treatment matter too. This article answers a single question: which preparation steps genuinely improve your chances, and which ones only add unnecessary worry?

Why does preparation take two to three months?

It takes roughly three months for an egg to travel from the start of maturation to the day it is collected. Sperm production follows a similar cycle of about two and a half to three months. That is why changes you make today usually show their effect in months rather than weeks. It helps to think of preparation as the three months before treatment, not the week before it.

The steps with the strongest evidence

• Stopping smoking. Smoking affects both egg number and quality and sperm parameters. Quitting is the single most valuable step of the preparation period. Passive smoking matters too.
• Bringing weight into balance. Both excess weight and being underweight can affect ovulation and the response to treatment. The goal is not a harsh diet but a moderate, sustainable change over the months before treatment.
• Stopping alcohol, reducing caffeine. Alcohol is best avoided during preparation. Keeping caffeine to no more than one or two cups of coffee a day is a reasonable approach.
• Taking folic acid. Started at least one month before pregnancy, folic acid reduces the risk of neural tube defects. This is the undisputed standard of the preparation period.
• Correcting vitamin D deficiency. If your blood level is low, replacement is appropriate. High doses without a deficiency have not been shown to add benefit.
• Sleep and movement. Regular sleep and 120–150 minutes of moderate exercise a week support general health and hormonal balance. Very intense training can work the other way.

Medical preparation: what should be settled before treatment

The second heading, as important as lifestyle, is the medical assessment completed before treatment starts. You can see how these steps are sequenced in our clinic, and the treatment as a whole, on the page describing our IVF treatment in Istanbul. The following are usually reviewed:

• Ovarian reserve: AMH and an ultrasound follicle count allow the stimulation protocol to be chosen individually.
• Thyroid and glucose balance: TSH and, where needed, an assessment of insulin resistance — easy to correct before treatment, with a clear effect.
• Assessment of the uterine cavity: Resolving polyps, intrauterine adhesions, submucous fibroids or hydrosalpinx before transfer supports the chance of pregnancy.
• Infection and carrier screening: Routine serology and, where indicated, genetic carrier screening.
• Your current medicines: Long-term medications should be reviewed for compatibility with pregnancy before treatment.

Preparation matters just as much for men

In roughly half of couples a male factor contributes at least in part, so preparation should never be one-sided. Stopping smoking and alcohol, weight control, allowing a few weeks of recovery after a febrile illness, avoiding prolonged heat exposure (sauna, a laptop on the lap) and assessing correctable problems such as varicocele where relevant can all contribute to sperm parameters.

Popular approaches with limited evidence

Many supplements are recommended online for the preparation period. CoQ10, inositol, DHEA and antioxidant combinations have been studied in some patient groups, but the available data are not strong enough to support routine use in every couple. The same is true of strict “fertility diets”, detox programs and prolonged bed rest. It is safer to discuss these products with your doctor than to start them on your own.

A rough preparation timeline

• Three months before: Stopping smoking and alcohol, setting a weight goal, starting folic acid, blood tests and reserve assessment.
• One to two months before: Assessment of the uterine cavity, any small procedures needed, thyroid and vitamin D corrections, protocol planning.
• The final week: Sleep routine, avoiding heavy exercise, finalising the medication calendar and your work or leave plan.

Does preparation guarantee success?

No. Preparation tries to tilt the process in your favour; it does not guarantee the result. Age and ovarian reserve remain the strongest determinants — if you would like to see that relationship in detail, our article on IVF success rates by age is a good starting point. In our centre, across all age groups, the pregnancy rate per transfer is 63% and the ongoing pregnancy rate 47%; these are averages, and your individual chance depends on your own history. In some couples, decisions made during preparation also shape whether the transfer will be fresh or frozen — we compared the two options in our article on fresh versus frozen embryo transfer.

Short answers to common questions

I don’t have three months — should I delay treatment? Usually no. If age is advanced or reserve is low, waiting carries its own risk. In that case it makes more sense to run preparation and treatment in parallel; the priorities should be set with your doctor.

I need to lose weight — how much is enough? The goal is not an “ideal weight” but a moderate, lasting reduction. Losing even a small part of your current weight can make a difference to ovulation and to the response to treatment.

Do I have to give up coffee completely? No. Keeping to no more than one or two cups a day is considered sufficient.

Does stress cause IVF to fail? Stress has not been shown to prevent pregnancy on its own. It does make the process harder to carry, so seeking support is a relief for you — not a reason to blame yourself.

Is sexual abstinence needed? Generally no. An interval of two to three days is advised before the day the sperm sample is given; longer abstinence brings no benefit.

Appointments and contact

To build a preparation plan of your own, decide which tests are genuinely necessary and set out your treatment calendar together, you are welcome to make an appointment at our clinic at Biruni University Hospital in Istanbul. Our aim is to avoid unnecessary tests and supplements while pursuing the highest chance your own data allow.

This article is for information only and does not replace a personal examination and medical assessment. Decisions about supplements, medication and treatment should be made together with your doctor, in the light of your own results and history.