There’s no single best birth control pill. The right one depends on your body, your health history, and what you want the pill to do beyond preventing pregnancy. All oral contraceptives have the same typical-use failure rate of about 7%, so the real differences come down to side effects, hormonal composition, and how well a pill addresses specific concerns like acne, heavy periods, or PCOS symptoms.
That said, the options break into two clear categories, and understanding what each one does will get you most of the way to an answer.
Combination Pills vs. Progestin-Only Pills
Combination pills contain both estrogen and a progestin. They work primarily by preventing your ovaries from releasing an egg each month. They also thicken cervical mucus and thin the uterine lining, making it harder for sperm to reach an egg and harder for a fertilized egg to implant. Because they suppress ovulation reliably, combination pills tend to give you predictable, lighter periods and are the type prescribed for acne and PCOS.
Progestin-only pills (sometimes called the “mini-pill”) skip the estrogen entirely. They rely mostly on thickening cervical mucus and thinning the uterine lining, though some formulations also suppress ovulation. The trade-off: progestin-only pills have a much tighter dosing window. If you take one more than three hours late, you need backup contraception for at least two days. Combination pills are more forgiving with timing.
One progestin-only pill is now available over the counter in the U.S., the first oral contraceptive approved for purchase without a prescription. All combination pills still require one.
Estrogen Dose: Low, Ultra-Low, and Why It Matters
Combination pills come in a range of estrogen doses, and that dose affects both side effects and bleeding patterns. Standard pills contain 30 to 35 micrograms of ethinyl estradiol. Low-dose pills contain 20 micrograms. The lowest option currently on the market contains just 10 micrograms.
Lower estrogen generally means fewer estrogen-related side effects like nausea, bloating, and breast tenderness. The catch is that very low estrogen can cause more breakthrough bleeding, especially in the first few months. The ultra-low 10-microgram pill addresses this with a 24/2 dosing schedule (24 active pills, 2 placebos) instead of the traditional 21/7 split. That shorter hormone-free window helps maintain steadier hormone levels and reduces unscheduled bleeding. Clinical trials showed good tolerance with this approach, though some women experienced a high rate of very light or absent periods. If you prefer a predictable monthly bleed, an ultra-low pill may not feel right. If you’d happily trade heavy periods for occasional spotting, it could be a good fit.
Current guidelines note that pills with 30 micrograms or more of estrogen don’t improve outcomes over lower doses for most purposes, so there’s rarely a medical reason to choose a higher-dose pill.
Best Pills for Acne
If clearer skin is a priority, combination pills are the category to focus on. The FDA has approved four oral contraceptives specifically for treating acne: Yaz, Beyaz, Estrostep FE, and Ortho Tri-Cyclen. The first three are monophasic, meaning every active pill delivers the same hormone dose. Ortho Tri-Cyclen is polyphasic, with hormone levels that shift across the cycle.
These pills work on acne by lowering the levels of androgens (hormones that drive oil production) circulating in your blood. Progestin-only pills don’t have this effect and can sometimes worsen acne, particularly formulations containing more androgenic progestins like levonorgestrel.
Best Pills for PCOS
Combination pills are the first-line treatment for managing PCOS symptoms like irregular cycles and excess hair growth. They’re more effective than metformin at regulating periods and reducing unwanted hair. For women with PCOS who have a BMI over 30, diabetes risk factors, or impaired glucose tolerance, adding metformin to a combination pill may offer additional benefit. For those with a BMI under 30, the added benefit of combining the two is minimal.
There’s no single “PCOS pill” that outperforms all others. The key is choosing a combination pill, and your provider will typically select one based on which progestin best addresses your specific symptoms.
Best Pills While Breastfeeding
Progestin-only pills have traditionally been the go-to for breastfeeding mothers because of concerns that estrogen could reduce milk supply. That recommendation still holds in most clinical settings, though some research has found that combination pills and progestin-only pills resulted in similar breastfeeding rates at both eight weeks and six months, with no difference in infant growth. Still, most providers start with a progestin-only option to be cautious, especially in the early weeks of breastfeeding when milk supply is being established.
Who Shouldn’t Take Combination Pills
The estrogen in combination pills carries cardiovascular risks for certain people. The 2024 U.S. Medical Eligibility Criteria classify several conditions as unacceptable risks for estrogen-containing contraceptives. If you’re 35 or older and smoke 15 or more cigarettes a day, combination pills are off the table due to a significantly elevated risk of heart attack and stroke. The same applies to people with a history of blood clots, certain types of migraine (specifically migraine with aura), or uncontrolled high blood pressure.
Progestin-only pills are safe for most of these groups, which is one of the main reasons they exist as a separate category.
Do Birth Control Pills Cause Weight Gain?
This is one of the most persistent concerns about the pill, and the data is reassuring. A pooled analysis of clinical trials found the average weight change on combination pills was just 0.3 kilograms (about two-thirds of a pound). Nearly 80% of participants stayed within 5% of their starting weight. The weight gain many people attribute to the pill is more likely explained by normal age-related changes in body composition that happen to coincide with starting contraception.
That said, not all hormonal methods are equal here. The injectable contraceptive (the shot) does have a real association with significant fat gain. And some progestins are mildly more androgenic than others. There’s limited evidence that androgenic progestins like levonorgestrel might slightly affect glucose tolerance, which could theoretically nudge weight regulation, while newer, less androgenic progestins don’t seem to have this effect. For most people on the pill, though, meaningful weight change is unlikely.
Conventional vs. Extended-Cycle Packs
Combination pills come in two pack formats. Conventional packs have 21 or 24 active pills followed by 4 to 7 inactive pills, giving you a monthly withdrawal bleed. Extended-cycle packs have 84 active pills and 7 inactive pills, so you only bleed four times a year.
The extended-cycle option is worth considering if you have painful or heavy periods, endometriosis, or menstrual migraines. The fewer hormone-free days you have, the fewer opportunities for those symptoms to flare. There’s no medical need to have a monthly period while on the pill. The withdrawal bleed during your placebo week isn’t a true period, and skipping it is safe.
What Happens When You Miss a Pill
For combination pills, the rules are straightforward. If you’re less than 48 hours late (meaning you missed one pill), take it as soon as you remember and continue the pack normally. No backup contraception needed. If you’ve missed two or more pills in a row (48 hours or more since your last dose), take the most recent missed pill immediately, discard any others you skipped, and use condoms or abstain for the next seven days while the hormones rebuild in your system.
Progestin-only pills have a much smaller margin. Being just three hours late is enough to compromise protection, and you’ll need backup contraception for at least two days. If consistent daily timing is hard for you, a combination pill or a non-pill method may be a better choice.
Choosing Based on Your Priorities
If you want the most flexibility with timing and the widest range of non-contraceptive benefits (acne control, lighter periods, PCOS management), a low-dose combination pill is the most versatile starting point. If you can’t take estrogen because of migraines with aura, smoking, blood clot history, or breastfeeding, a progestin-only pill is your main oral option. If predictable periods matter to you, a standard 21/7 or 24/4 combination pack will deliver that. If you’d rather bleed as little as possible, an extended-cycle pack or ultra-low-dose pill can get you there.
The “best” pill is ultimately the one that fits your health profile, manages whatever symptoms matter to you, and has side effects you can live with. Most people try one or two formulations before landing on the right fit, and switching is common and perfectly fine.