NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated July 13, 2026

Combined Oral Contraceptive

Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026

Combined oral contraceptives (COCs) contain synthetic estrogen (usually ethinyl estradiol 20–35 mcg) and a progestin component. They are primarily used for contraception but are also prescribed for menstrual regulation, dysmenorrhea, endometriosis, acne, and polycystic ovary syndrome (PCOS). They are among the most widely used medications worldwide with an extensive safety record when appropriately prescribed.

Evidence tier
Strong
Indexed sources
10 2020–2025
Interactions
0
Depletes
7 nutrients
Read the sources → Compare profiles
Publication status

Exploratory record, not a reviewed medical publication.

See the editorial and medical-review policies for the publication gate.

This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.

In short

What the research says.

A quick, data-only summary. The full evidence, dosing, and sources are below.

Combined oral contraceptives (COCs) contain synthetic estrogen (usually ethinyl estradiol 20–35 mcg) and a progestin component. NutriStack rates the supporting evidence as strong. Common adult dosing is Ethinyl estradiol 20–35 mcg + progestin (varies by product); taken once daily for 21–24 active days followed by 4–7 placebo days (as prescribed by your physician), though a prescriber sets the actual dose. With long-term use it can deplete vitamin b6, vitamin b12, folate. This profile indexes 10 sources.

What it's good for
  • Highly effective contraception (>99% with perfect use)
  • Menstrual cycle regulation
  • Reduced dysmenorrhea and menstrual blood loss
  • Improvement in acne and hirsutism
  • Reduced risk of ovarian and endometrial cancer with long-term use2,8
What to watch for
  • Nausea (usually transient, improves after 1–3 cycles)
  • Breast tenderness
  • Headache
  • Smoking in women over 35 years old (significantly increased cardiovascular risk)
  • History of or current venous thromboembolism (DVT/PE)10,7

The bottom line

Evidence rating strong. Most-documented uses: highly effective contraception (>99% with perfect use), menstrual cycle regulation, reduced dysmenorrhea and menstrual blood loss. 10 sources indexed (2020–2025), with 0 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

The progestin component suppresses the LH surge, preventing ovulation, while both the estrogen and progestin thicken cervical mucus (impeding sperm penetration), thin the endometrial lining (reducing implantation potential), and alter tubal motility. The estrogen component also suppresses FSH, preventing follicular development, and stabilizes the endometrium to prevent breakthrough bleeding.

Class
Hormonal Contraceptive
Absorption
Fat-soluble; take with food
Dosing

Dosing & protocol.

Common range
Ethinyl estradiol 20–35 mcg + progestin (varies by product); taken once daily for 21–24 active days followed by 4–7 placebo days (as prescribed by your physician)
Recommended form
Oral tablet; taken daily at the same time each day

Can be taken with or without food. Take at the same time each day for optimal efficacy. Vomiting or diarrhea within 2 hours of taking may reduce effectiveness.

Depletions

What it depletes.

Nutrients this medication can lower over time, and what to replace.

Vitamin B6

Moderate

Estrogen-containing contraceptives can increase vitamin B6 turnover and lower circulating PLP in susceptible users.

Replace Vitamin B6Monitor Plasma PLPOnset Often within months of continuous use

Vitamin B12

Mild

Long-term oral contraceptive use is associated with lower measured B12 status, likely from altered binding proteins and absorption dynamics.

Replace MethylcobalaminMonitor Serum B12 + methylmalonic acidOnset Usually after months of use

Folate

Moderate

Estrogen-progestin contraceptives can lower folate status through altered metabolism and increased requirement in some users.

Replace MethylfolateMonitor Serum folate or RBC folateOnset Usually after months of use

Magnesium

Mild

Oral contraceptives are associated with lower magnesium status in some users, likely through altered renal handling and demand.

Replace Magnesium GlycinateMonitor RBC magnesiumOnset Usually after months of use

Zinc

Mild

Estrogen-containing contraceptives can modestly lower zinc status, likely through altered hepatic protein synthesis and increased losses.

Replace Zinc PicolinateMonitor Serum zincOnset Usually after months of use

Vitamin C

Mild

Some users show lower plasma vitamin C during chronic oral contraceptive use, likely from increased oxidative turnover.

Replace Vitamin CMonitor Plasma vitamin COnset Usually after months of use

Selenium

Mild

Estrogen-containing contraceptives can modestly alter selenium handling and lower functional selenium status in some users.

Replace SeleniumMonitor Serum seleniumOnset Usually after months of use

Full Combined Oral Contraceptive depletion and interaction guide →

Safety

Full safety detail.

Side effects

  • Nausea (usually transient, improves after 1–3 cycles)
  • Breast tenderness
  • Headache
  • Breakthrough bleeding or spotting
  • Mood changes
  • Decreased libido in some women
  • Venous thromboembolism (3–4x baseline risk, still low absolute risk)
  • Weight changes (minimal with modern formulations)

Contraindications

  • Smoking in women over 35 years old (significantly increased cardiovascular risk)
  • History of or current venous thromboembolism (DVT/PE)10,7
  • History of stroke or ischemic heart disease
  • Migraine with aura at any age
  • Known thrombophilia (Factor V Leiden, etc.)8
  • Breast cancer (current or within 5 years)8,2
  • Severe hepatic disease or liver tumors2
  • Uncontrolled hypertension (≥160/100 mmHg)
Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Meta-analyses & systematic reviews

5

Reference material

5
FAQ

Common questions.

Quick answers about Combined Oral Contraceptive, drawn from the data on this page.

What is Combined Oral Contraceptive?

Combined oral contraceptives (COCs) contain synthetic estrogen (usually ethinyl estradiol 20–35 mcg) and a progestin component. They are primarily used for contraception but are also prescribed for menstrual regulation, dysmenorrhea, endometriosis, acne, and polycystic ovary syndrome (PCOS). They are among the most widely used medications worldwide with an extensive safety record when appropriately prescribed.

What is Combined Oral Contraceptive used for?

Commonly cited benefits of Combined Oral Contraceptive include: Highly effective contraception (>99% with perfect use); Menstrual cycle regulation; Reduced dysmenorrhea and menstrual blood loss; Improvement in acne and hirsutism; Reduced risk of ovarian and endometrial cancer with long-term use. NutriStack rates the overall evidence as strong.

What is a typical dose of Combined Oral Contraceptive?

A typical adult dose of Combined Oral Contraceptive is Ethinyl estradiol 20–35 mcg + progestin (varies by product); taken once daily for 21–24 active days followed by 4–7 placebo days (as prescribed by your physician). The commonly recommended form is Oral tablet; taken daily at the same time each day. These are general ranges, not personalized advice; confirm the right dose with a clinician.

What are the side effects of Combined Oral Contraceptive?

Reported side effects include nausea (usually transient, improves after 1–3 cycles), breast tenderness, headache, breakthrough bleeding or spotting, mood changes, decreased libido in some women. This is educational information; check with a healthcare professional before use.

How strong is the evidence for Combined Oral Contraceptive?

NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.

Use this with your stack

Combined Oral Contraceptive in NutriStack.

Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.

Download on the App Store → Read the methodology

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.