I'm Irene, a Japanese-licensed pharmacist working in a Japanese drugstore. I was born in Taiwan and moved to Japan at around age 10. With these familiar gold-labelled tablets, I would check three things before buying: the full suffix, whether you want a caffeine-containing product, and what vitamins or medicines you already take.
The useful choice is the formula, not the word “Premium”
- Gold α Premium: consider this exact formula if you want the version containing eucommia and peony extracts alongside eleuthero, astragalus and garlic-derived oxoamidine. Its name does not establish a better result for every person.
- Gold α: a different Class 3 medicine containing eleuthero, astragalus, oxoamidine and nicotinamide. It shares several vitamin amounts with Premium; it is not simply the same formula in an older box.
- Gold A: a Japanese designated quasi-drug containing gamma-oryzanol and vitamin A in addition to shared ingredients. Pay particular attention to its pregnancy/planning and overlapping-vitamin precautions.
- Looking for caffeine-free tablets or buying for someone under 15: none of these three fits that requirement. Each contains 25 mg caffeine per tablet and is labeled for ages 15 and older only.
There is substantial ingredient overlap. Choose one suitable product rather than taking several Gold versions together.
Recognise the exact products
Gold α Premium: look for PREMIUM
キューピーコーワゴールドαプレミアム is a Class 3 OTC medicine. The pictured current package contains 90 tablets; the maker also lists 30, 160 and 280 tablets. Premium contains eucommia bark and peony root extracts, and a slightly different eleuthero amount from Gold α.
Gold α: the medicine without PREMIUM
キューピーコーワゴールドα is also a Class 3 OTC medicine, listed in 90- and 160-tablet packs. The pictured box contains 90 tablets. Along with eleuthero and astragalus extracts, it contains garlic-derived oxoamidine and nicotinamide.
Check the complete Japanese name: ゴールドα錠 is a separately named designated quasi-drug in the manufacturer's convenience-store range. Its formula should not be substituted for the Gold α medicine compared here.
Gold A: a separate quasi-drug formula
キューピーコーワゴールドA is a designated quasi-drug, not a Class 3 medicine or an ordinary food supplement. The current outer box shown contains 180 tablets. Its distinctive ingredients include gamma-oryzanol and vitamin A oil; it also contains nicotinamide.
The three labels share broad uses: tonic support and weak constitution, and nutritional supplementation during physical fatigue, reduced strength after illness, loss of appetite, nutritional disorders, fever-associated wasting illness, pregnancy or breastfeeding. These indications do not diagnose the cause of tiredness, and they do not make every product appropriate for every pregnant or breastfeeding person.
What stays the same?
All amounts in the next two tables are per 2 tablets, the maximum labeled daily amount. A single dose is one tablet, so its ingredient amounts are half the table values.
| Active ingredient shared by all three | Amount per 2 tablets in each product |
|---|---|
| Garlic-derived oxoamidine powder | 50 mg |
| L-Arginine hydrochloride | 50 mg |
| Thiamine nitrate, vitamin B1 ingredient | 10 mg |
| Riboflavin, vitamin B2 | 4 mg |
| Pyridoxine hydrochloride, vitamin B6 ingredient | 10 mg |
| Tocopherol calcium succinate, vitamin E ingredient | 20.7 mg |
| Sodium L-ascorbate, vitamin C ingredient | 112.6 mg |
| Anhydrous caffeine | 50 mg |
The maker's comparison identifies the vitamin E ingredient as equivalent to 20 mg dl-α-tocopheryl succinate and the vitamin C ingredient as equivalent to 100 mg ascorbic acid. Those ingredient-form amounts should not be mistaken for extra separate vitamins.
What changes between the formulas?
“Not listed” below means it is absent from that product's active-ingredient list.
| Additional or differing active ingredient per 2 tablets | α Premium | Gold α | Gold A |
|---|---|---|---|
| Eucommia dry extract | 14 mg, from 200 mg crude drug | Not listed | Not listed |
| Peony dry extract | 17.1 mg, from 120 mg crude drug | Not listed | Not listed |
| Eleuthero dry extract | 14 mg, from 350 mg crude drug | 12 mg, from 300 mg crude drug | Not listed |
| Astragalus dry extract | 30 mg, from 240 mg crude drug | 30 mg, from 240 mg crude drug | Not listed |
| Nicotinamide | Not listed | 25 mg | 25 mg |
| Gamma-oryzanol | Not listed | Not listed | 10 mg |
| Vitamin A oil | Not listed | Not listed | 2 mg, providing 2,000 vitamin A units |
Irene's comparison tip: Premium adds certain herbal ingredients, but Gold α and A contain nicotinamide that Premium does not. Several shared vitamin amounts and the caffeine amount are identical. There is no single ingredient-count scale that tells you which will suit you best.
How to take them
For all three, ages 15 and older take one tablet per dose, once or twice daily, with water or lukewarm water. Under 15: do not use. The labels allow use before or after food, morning, afternoon or evening. When taking two doses in a day, the manufacturer recommends leaving at least six hours between them.
- Check the exact suffix and your existing medicines, vitamin tablets and energy products. Do not stack Gold formulas to make a larger dose.
- Take one tablet, not two at once. The two-tablet ingredient table represents the maximum daily total.
- Include its caffeine when considering coffee, tea, energy drinks and caffeine-containing medicines. A label allowing evening use does not mean the product is caffeine-free or helpful for sleep. If caffeine affects your sleep, discuss timing or another option with a pharmacist.
- Mark the bottle-opening date. Keep the original bottle tightly closed, cool and dry, away from sunlight and children. Avoid wet hands; discard tablets accidentally wetted. Follow the expiry date and the label's guide to use within six months after opening.
Pregnancy, other products and adverse effects
Gold A has a specific vitamin A precaution. Consult a doctor or pharmacist first if you are in the first three months of pregnancy, may be pregnant, or are planning a pregnancy. Its label also says to consult if receiving medical treatment and to avoid excessive intake when combining it with other vitamin-containing products. Bring your prenatal or multivitamin label to that discussion.
For Premium and Gold α, the labels specifically require consultation before use if medicines or similar products have caused allergic symptoms in the past. If you are pregnant, breastfeeding, receiving treatment or taking other supplements, ask for an individual review rather than choosing from the front-of-box claims. The inclusion of pregnancy and breastfeeding in the nutritional indications is not a substitute for checking the whole regimen.
For all three, stop and seek advice if a rash, redness, itching, nausea or vomiting occurs. Diarrhea that persists or worsens also means stop and consult. Vitamin B2 can turn urine yellow; this does not explain every possible new urinary symptom.
The reassessment wording differs: Premium and Gold α say to stop and consult if symptoms do not improve after taking them for a while, without specifying a number of days. Gold A specifies about one month. Do not treat all three as a one-month course, or wait that long when the tiredness itself needs assessment.
When tiredness needs more than another bottle
See a healthcare professional if tiredness has lasted a few weeks without a clear reason, affects daily life, or comes with symptoms such as weight loss, mood changes or gasping/choking during sleep. These are general fatigue-assessment pointers, separate from the Japanese product labels. Rest, regular meals and sleep still matter; increasing tablets is not a way to make up for persistent unexplained fatigue.
At the shelf, remember full name → category → caffeine → overlapping ingredients. Premium, α and A give you different formulations. A clear reason for choosing a particular formula is more useful than the most impressive suffix.
Official sources and image credits
Current Japanese product information, linked full labels and package images checked on 14 October 2026. Follow the exact product you purchase.
- Kowa: Gold α Premium
- Kowa: Gold α Premium Japanese package information
- Kowa: Gold α
- Kowa: Gold α Japanese leaflet
- Kowa: Gold A
- Kowa: Gold A Japanese leaflet
- Kowa: exact three-formula ingredient comparison
- NHS: tiredness, sleep and when to seek assessment
Product photographs: Kowa official product pages.
