If I want to buy 10 grams each of Vitamin B1, B2, B6, and B12, mix them together, and put them into capsules (or if there's a way to dissolve them in water, please advise), can I do that? If it's capsules, what size capsule should I buy to mix them all and take daily? For B1, I should probably buy it as 1%.

Mixing and encapsulating 10 grams of each Vitamin B1, B2, B6, and B12 is strongly not recommended as the proposed quantities are far too high for daily consumption and could be harmful to health. While B vitamins are water-soluble, excessive intake can have adverse effects.

Here is additional information and advice:

• Water Solubility: All the B vitamins you mentioned, including Vitamin B1 (Thiamine Hydrochloride), Vitamin B2 (Riboflavin), Vitamin B6 (Pyridoxine Hydrochloride), and Vitamin B12 (Methylcobalamin 1%, Cyanocobalamin 99%, Cyanocobalamin 1%), are highly water-soluble. You can dissolve them in water for consumption. Specifically, Vitamin B12 (Cyanocobalamin 99%) is noted to dissolve in water and produce a pink liquid.
• Recommended Dosage: The daily requirement for B vitamins is very small, typically in micrograms (mcg) or milligrams (mg), not grams (g). Mixing 10 grams of each vitamin (which equals 10,000 milligrams) would be an excessively high and potentially dangerous amount.
• Safety: Consuming vitamins in such high quantities without guidance from a medical professional or pharmacist can lead to undesirable side effects.
• Encapsulation: Even if you still wish to encapsulate, the total volume of 40 grams of powder (10 grams x 4 types) would be too large to fit into a standard capsule for regular daily intake. Encapsulation should be performed by professionals who can calculate appropriate and safe dosages.
• Recommendation: We strongly advise you to consult a doctor or a nutritionist to get professional advice on the appropriate dosage of B vitamins for your body's needs and safe preparation or consumption methods.

Our available Vitamin B products include Vitamin B1 (Thiamine Hydrochloride), Vitamin B2 (Riboflavin), Vitamin B6 (Pyridoxine Hydrochloride), Vitamin B12 (Methylcobalamin 1%), Vitamin B12 (Cyanocobalamin 99%), and Vitamin B12 (Cyanocobalamin 1%).