
Sun geometry
Vitamin production only kicks in when the sun rises higher than 45 degrees above the horizon. If your shadow is longer than your height, UVB radiation is completely absorbed by the atmosphere.
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If you had to pick just one supplement for our latitudes, the answer is almost always the same: vitamin D3. It supports strong bones and teeth, morning energy, immunity and a steady mood when the sky outside is gray for half the year.

On store shelves, nutraceuticals come as gummy lozenges, alcohol solutions, drops and gelatin capsules. Let's look at the biological value of each formula.

A plant-based isomer obtained by irradiating mushrooms and yeast cultures. It has low bioavailability for humans and is considered an outdated compound in modern practice.

A compound identical to the substance the skin synthesizes under sunlight. It quickly enters metabolism, steadily raises plasma 25(OH)D levels and reliably maintains the result.

Vitamin K2 regulates calcium metabolism: it prevents calcium from depositing in blood vessel walls and soft tissues, directing the mineral to the skeleton and dentin. At doses of 2000-5000 IU, the D3 + K2 combination is considered optimal for safety.
The best way to take it depends on age group and digestive characteristics.

Suitable for adults. The fat-soluble compound is already dissolved in olive or coconut oil, so it is absorbed in the small intestine right after swallowing. A practical, convenient everyday format.

Suitable for infants and toddlers. Good American brands contain only pure vegetable oil and D3: no sweeteners, preservatives or allergens.

A common pharmacy product. To dissolve the fat-soluble vitamin in water, alcohol, stabilizers and preservatives are added, which cause colic and rashes in some children.

A convenient choice for children over three and for anyone who dislikes drops and can't swallow pills. Keep the package out of children's reach to prevent accidental overconsumption.
Unless you live year-round at the equator or in the tropics, it's impossible to get the physiological norm of the vitamin naturally.

Vitamin production only kicks in when the sun rises higher than 45 degrees above the horizon. If your shadow is longer than your height, UVB radiation is completely absorbed by the atmosphere.

The necessary ultraviolet radiation is available only at midday from late May to mid-August. From autumn to late spring, even on a clear, frosty noon, vitamin synthesis in the skin is zero.

A tan activates melanin production, which acts as a natural barrier against UVB rays. Sunscreen with SPF 15 or higher reduces the body's vitamin D production to nothing, blocking up to 98% of radiation.
You can't stock up on the vitamin in advance. The body uses up its reserves in the liver and fatty tissue in about 3-4 weeks. What you accumulate during two weeks at the seaside won't last even until early November. That's why vitamin D is taken either year-round or at least daily from September to May.
When you lack vitamin D3, your energy reserves drop fast: it's essential for mitochondria (the cell's power stations), muscles and mood balance.

D3 is what triggers the synthesis of ATP, the fuel for every cell. Too little vitamin means mitochondria lose performance, and you have less energy.

Without D3, the absorption of calcium and phosphorus is disrupted. The result: sluggish muscles, aches and quick fatigue even from usual workloads.

The sunshine vitamin is tied to serotonin and dopamine. When there's too little of it, apathy, anxiety and constant drowsiness set in.

Cleveland Clinic lists persistent fatigue and lack of energy among the first signs that the body is short on vitamin D.
Three basic rules to help your cells fully absorb the supplement.
01Cholecalciferol moderately energizes the nervous system and slows the evening production of melatonin, the sleep hormone. Taking it before bed may lead to insomnia.
02Omelet, toast with butter or cheese, avocado, nuts: fats in food trigger the release of bile, which is needed to absorb vitamin molecules. Taking it on an empty stomach is pointless.
03The preventive norm for an adult without testing is 2000 IU per day. If you have symptoms of deficiency, get a 25-OH vitamin D test: if the level is below 20-30 ng/mL, your doctor will prescribe a course of 5000 to 10,000 IU.
Preventive regimens, daily dose
0-12 months400-1000 IU
1-3 years1000-1500 IU
3-18 years1000-2000 IU
Adults, prevention2000 IU
Adults with deficiency5000 IU as a courseSupplements are essential for breastfed infants, since breast milk contains very little vitamin D. For confirmed deficiency in adults, 5000 IU for 2 months is usually prescribed, followed by a maintenance dose of 2000 IU.
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A selection of trusted supplements with premium-grade ingredients, verified purity, and good value per serving.
A base dose to support hormonal balance and the musculoskeletal system during low-sunlight seasons. Safe for continuous daily use without a prescription.

The platform's bestseller: an easily absorbed fish gelatin shell and a tiny capsule size. A year's supply of basic vitamin D at a great price.
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A classic from a GMP-certified brand. Dissolved in olive oil, which protects the active ingredient from oxidation.
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A nutraceutical brand from California. A GMO-free and gluten-free formula that keeps the active ingredient concentration stable throughout its shelf life.
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Signature packaging made of tinted glass that blocks light. A fully vegetarian formula, taken with a substantial meal.
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The USP Verified mark confirms the purity of the raw materials and the accuracy of the dosage in every softgel.
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A convenient alternative to capsules for adults. Easy to dose with a dropper, with a gentle citrus flavor and good absorption.
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A large jar with 240 servings. Made to GMP standards with an oil base for even absorption of cholecalciferol.
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A compact format of a popular nutraceutical. Fish gelatin and a capsule size that is easy to swallow.
Help with your purchase →A higher concentration to quickly bring levels back to normal. Taken in limited courses when a deficiency is confirmed by a test.

A proven option for a 2-3 month course when 25(OH)D levels are below 30 ng/ml. Stable olive oil base.
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An option for a three-month course to correct a deficiency. Hypoallergenic fish gelatin shell with no dyes.
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High-potency cholecalciferol to quickly restore energy and immune response and relieve symptoms of fatigue.
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The maximum therapeutic concentration for loading protocols in cases of severe deficiency, under a doctor's supervision.
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A premium Norwegian brand with independent lab testing for purity from heavy metals.
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Plant-based D3 from wild-grown lichen, with no lanolin from sheep's wool. A solution for vegans.
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A time-tested formula for correcting a lab-confirmed deficiency.
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A large family-size jar for several restorative courses, as recommended by a specialist.
Help with your purchase →Dual-action formulas: vitamin K2 activates the osteocalcin protein, helping prevent arterial calcification and directing minerals into the bone matrix.

Vegan complex: K2 as MenaQ7 paired with organic MCT coconut oil.
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A gentle daily combo to support cardiovascular and joint health in older age.
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A clinical nutraceutical brand. Free of soy, preservatives and allergens, and lets you measure your exact individual dose.
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Three-in-one formula: D3 combined with a range of K isomers (K1, K2 MK-4, MK-7) and iodine to support the thyroid gland.
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Under-the-tongue spray: micro-droplets are quickly absorbed through the lining of the mouth, bypassing the stomach and easing the load on the liver.
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A balanced formula for vascular protection (2000 IU D3). The MenaQ7 form is obtained through fermentation and stays in the blood for a long time.
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A D3 and K2 combo in vegetable capsules. Helps maintain bone density and artery elasticity.
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A vegan formula with no unnecessary additives. Convenient routine: 1 capsule a day with breakfast.
Help with your purchase →Highly purified drops in MCT coconut oil. They let you follow pediatric guidelines precisely without irritating your child's digestive system.

A choice for babies from the first weeks: just MCT oil and cholecalciferol. No alcohol, sugar or preservatives.
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A patented dropper dispenses exactly 1 drop with no risk of a stream. Odorless and tasteless drops.
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Pure drops in vegetable oil. A step of 400 IU per drop lets you build the right dose for any age.
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A Canadian bestseller. One drop on a pacifier or breast provides a baby's daily requirement.
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USDA Organic certified. The brand makes products for newborns' delicate digestion.
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Affordable baby drops in coconut oil. No artificial additives, with a convenient dropper.
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A large bottle of D3 oil solution. Neutral taste, and a drop is easy to add to baby formula.
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A gentle D3 and K2 combo for the development of teeth and skeleton during active growth.
Help with your purchase →Forms for preschoolers, school-age kids and teens: tasty lozenges and drops that are easier to take than capsules. Dosages are designed for growing bodies.

A pediatrician favorite. Natural berry flavor, sweetened with vegetable glycerin and no sugar.
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Citrus pectin instead of gelatin. The jar contains a mix of flavors: strawberry, lemon and orange.
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Zero refined sugar. Sweetness comes from natural xylitol, which helps protect tooth enamel from cavities.
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Soft gummies that don't stick to your teeth. A 300 IU dose per piece gives you flexible dosing.
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A higher dose for a growing body: 1 drop contains 1000 IU and dissolves easily in juice.
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A complete formula: cholecalciferol supplemented with EPA/DHA fatty acids, iodine, zinc and B vitamins.
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Natural ingredients from organic fruits. 800 IU in every chewable lozenge.
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Watermelon flavor for kids aged three and up. Strict raw material control from a global leader in nutraceuticals.
Help with your purchase →Recommendations and dosages are provided for informational purposes only. To choose a personal regimen and rule out contraindications, get a blood test and consult a doctor.
Buy genuine American supplements from the iHerb catalog: a tax-free warehouse in Delaware, fast buyout and door-to-door delivery in 5-10 days.
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Delivery from the USA since 2008: originals without pharmacy markups and fast logistics.
01Items ship directly from iHerb hubs, so there is no risk of counterfeits and fresh expiration dates are guaranteed.
02Russian stores mark up foreign brands 2-3 times. By buying directly in the USA, you get supplements at the real price.
03Our warehouse in Delaware is exempt from US Sales Tax, saving you up to 7-10% on every purchase.
04We combine orders from different stores into one box and remove extra packaging, reducing the final weight.
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06If a store doesn't accept Russian cards, send us the product link and we'll buy the order for you, with payment in rubles.
Yes, only originals. Purchases are placed directly on the American iHerb. You receive vitamins with a factory seal, a valid expiration date and manufacturer batch codes. If you have a foreign bank card, you can buy out the parcel to our warehouse yourself.
Infants: MCT oil drops at 400 IU. Preschoolers and teens: berry-flavored drops or lozenges. Adults for prevention: 2000 IU oil capsules. If a blood test confirms a deficiency, a course of 5000 IU or more is prescribed, paired with K2.
After you sign up at pochtoy.com, you get a personal address at a tax-free warehouse in the US. Use it as the Shipping Address on iHerb, or send a cart link to our operators for buyout. We'll receive the items in your locker, pack them and forward them to you.
If you don't have a foreign card, our buyers will check out your iHerb cart for you. With promo code GETIHERB the buyout service is free: you pay only for the items and shipping. Pay in rubles, foreign currency or cryptocurrency.
From 5 to 10 business days from the date the parcel leaves the US warehouse. A special rate applies to iHerb supplements: $12.99 for a package up to 1 kg and $38.90 for a parcel up to 3 kg. Weight is calculated without excess packaging.
Cholecalciferol (D3) is identical to the substance your skin produces in the sun, so it's absorbed quickly and reliably. Ergocalciferol (D2) is synthesized from mushrooms and yeast; it's poorly metabolized and considered outdated.
Morning or midday is best. D3 energizes the nervous system and may reduce production of the night-time hormone melatonin, so taking it in the evening often causes trouble falling asleep.
Absolutely. Cholecalciferol is fat-soluble. Take it with a meal that contains fats: fried eggs, porridge with butter, avocado, fish or nuts. On an empty stomach, absorption is minimal.
A preventive dose of 2000 IU is safe for an adult without any tests. If you suspect a deficiency, get a 25-OH vitamin D blood test: if the result is below 20-30 ng/ml, a doctor will choose a course of 5000-10,000 IU for 1-2 months.
Vitamin K2 directs calcium to the skeleton and tooth enamel, keeping it from building up in blood vessels and kidneys. At doses up to 2000 IU, plain D3 is enough, while at higher doses a D3 + K2 combination is better.
Not only can they, they need to: breast milk contains very little of this vitamin. Liquid MCT oil drops at 400 IU, free of alcohol, flavorings and sugar, are suitable for infants.
Oil drops with a dropper are best for infants, lozenges for older children, and capsules or drops for adults who find it hard to swallow pills.
Yes. In Moscow, St. Petersburg, the Urals, the Volga region and Siberia, the sun sits too low on the horizon for most of the year. From October to May, the atmosphere blocks synthesis in the skin, so almost everyone needs a supplement.
No. Your body uses up its reserves in 3-4 weeks. What you get on a two-week vacation won't last even until mid-autumn, so people keep taking it either all year round or from September to May.
You can pay for items and shipping with Russian cards (MIR, Visa, Mastercard), foreign currency cards, or cryptocurrency. With promo code GETIHERB the buyout is free: you pay only for the supplements and the weight of the parcel.
iHerb is a large American store for vitamins, natural cosmetics and organic food. It offers fresh batches, regular sales and GMP standards control. Pochtoy.com delivers any iHerb order to Russia and Belarus.
No. If you don't have a foreign bank card, our team will buy the items for you, and with promo code GETIHERB the service has no commission. If you do have a card, you can buy on your own.
The Pochtoy.com warehouse address in Delaware is your delivery point. Stores send orders to it, and we receive them, inspect them, consolidate them if needed and ship them to your city.
Our warehouse is in the state of Delaware. It's a tax-free zone (0% Sales Tax), which saves you up to 7-10% on every purchase compared to shipping to other states.
Yes, the Pochtoy.com warehouse combines items from different stores for free and removes extra packaging to cut weight. But thanks to the special iHerb rate, sending vitamins as a separate parcel up to 1 kg or 3 kg is the most cost-effective option.
Every incoming parcel is stored at the Pochtoy.com warehouse for free for up to 70 calendar days. That's enough time to wait for all your purchases and send them together.
Yes, insurance is available ($3 for parcels up to $100 and $5 for orders over $100). It covers the declared value if your parcel is damaged or lost during international shipping.
The service automates the process: the declaration is filled out for free from an order screenshot or a list of links. You won't have to deal with HS codes.
We deliver parcels from the US to Russia and Belarus. Parcels travel by air from Delaware and arrive in 5-10 business days, either to your door by courier or to pickup points.
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