Prenatal

There are various forms of prenatal supplements on the market, tailored to the needs and preferences of pregnant women:

• Film-coated tablets – the classic form, used in products such as Jamieson Prenatal or Solgar Prenatal Nutrients.
• Soft gelatin capsules, used especially when the product contains essential fatty acids (DHA), as is the case with GNC Women's Multivitamin Prenatal Plus DHA & Iron.

Prenatal supplements are recommended:

• During preconception, to optimize folic acid, iron, and vitamin D levels;
• During pregnancy, to support intrauterine development of the fetus and prevent maternal nutritional deficiencies;
• During breastfeeding, when maternal needs remain high and the composition of breast milk depends on the mother's nutrient intake;
• In multiple pregnancies or high-risk pregnancies (e.g., pregnancies after age 35, gestational diabetes), where nutritional needs are higher.

The dosage regimen depends on the form of administration, the type of product, and the doctor's recommendations. Generally, 1-2 tablets are taken daily with meals.

It is important to follow the manufacturer's recommended dosage or adjust it according to the recommendation of the obstetrician or pharmacist, depending on individual nutritional status.

Although prenatal supplements are generally safe, there are some contraindications or precautions:

• Known allergy to one of the excipients (e.g., gelatin, soy, fish—in the case of DHA)
• History of hemochromatosis or other conditions with excessive iron accumulation
• Hypervitaminosis (e.g., excess vitamin A, contraindicated in pregnancy)

If you suffer from severe chronic diseases, seek medical advice before taking this dietary supplement.

Prenatal supplements should not be considered a substitute for a balanced diet, but an essential aid during periods of increased requirements.

It is recommended to start supplementation at least 1-3 months before conception, especially with folic acid, to reduce the risk of neural tube defects.

In the case of DHA supplements (e.g., GNC), it is important that the source be certified free of marine contaminants (heavy metals).

Side effects are rare and usually mild, but may include:

• Gastrointestinal disorders: nausea, constipation, or diarrhea, especially due to iron or magnesium.
• Allergic reactions to excipients (especially in products containing soy, fish, or gluten—if not certified gluten-free).

Iron can reduce the absorption of tetracyclines, fluoroquinolones, and levothyroxine – it is recommended to take it at a distance from these drugs (2-4 hours). Iron absorption is increased in the presence of vitamin C, but decreases in the presence of dairy products or black tea.

Calcium and magnesium may interfere with the absorption of some antibiotics.

Vitamin K may interact with anticoagulants (e.g., warfarin) – caution and monitoring are required.

Overdose with prenatal supplements, although rare, can be dangerous:

• Iron overdose is one of the most common causes of accidental poisoning in children – which is why products should be kept out of their reach.
• Excessive doses of vitamin A (especially retinol) can be teratogenic.
• High doses of folic acid can mask a vitamin B12 deficiency.

In case of accidental administration of large doses, especially in children, emergency medical assistance is required.

Prenatal supplements should be stored at temperatures between 15–25°C, away from moisture and direct light. It is recommended to store them in their original packaging, tightly closed and out of the reach of children. Do not use after the expiry date printed on the packaging.

• Mayo Clinic, Pregnancy Week by Week
• Cleveland Clinic, Prenatal Vitamins
• NHS.uk, Vitamins and Supplements During Pregnancy
• PubMed, A Critical Assessment of Prenatal Supplements: Are They Living Up to the Hype?