Anyone choosing a food supplement today is deciding not only on an active ingredient, but also on a form. Capsules, tablets, powders, liquids and softgels each have their own physical and manufacturing properties. These determine how an active ingredient is packaged, protected, released and ultimately absorbed. No form is fundamentally better than another. The useful question is which form fits which task.
Three axes help with this assessment: functionality (what the form does with the active ingredient), ease of intake (how pleasant and practical the application is in everyday life) and manufacturing (which processes are involved and which excipients they require).
Capsules
Hard capsules made from gelatine or plant-based HPMC are the classic form for dry active ingredients. They protect the contents from light and moisture, neutralise taste and are available in many sizes. Acid-resistant variants survive passage through the stomach and only open in the small intestine.
The limits lie less in the shell than in the release itself. A capsule opens at a single point and releases its entire contents in one burst. For complexes with several active ingredients that require different absorption sites and synergies, this is a structural constraint. We described this in detail in Why standard capsules are not enough.
Tablets
Tablets are the most cost-effective mass form. They deliver precise dosages, are extremely stable in storage and often contain high amounts of active ingredient per unit. In industrial manufacturing they are hard to beat.
The price for this is the processing. Powders are compressed under high pressure into solid units, often with binders, disintegrants and lubricants. The frictional heat this generates can partially damage heat-sensitive vitamins. Larger tablets are also difficult for many people to swallow, and they dissolve in the gastrointestinal tract more slowly than most other forms.
Powders
Powders need no shell, no compression and no binders. The active ingredient is present unchanged and dissolves quickly once stirred in. This makes powders especially flexible: dosages can be adjusted, several active ingredients can be combined, and absorption begins early.
The catch is the taste. Many micronutrients taste bitter, sour or metallic. Classic powder products offset this with flavourings, sweeteners or sugar. Anyone who wants to avoid such additives has to accept the natural taste. In addition, a free powder offers no protection against stomach acid, so sensitive active ingredients can be broken down prematurely.
Liquids
Liquid preparations, for example as drops or syrup, are absorbed especially quickly. They are easy to take, suit children or older people with difficulty swallowing well, and often work with a low concentration of active ingredient that can be finely dosed.
The weaknesses of this form lie in stability. Many active ingredients lose effectiveness more quickly in aqueous solution, oxidise or react with other ingredients. Preservatives or sweeteners are often necessary to secure shelf life and taste. Once opened, the storage period is limited.
Softgels
Softgels are soft capsules filled with oil or a lipid suspension. For fat-soluble active ingredients such as omega-3, vitamin D, vitamin E or coenzyme Q10, they are one of the best carrier forms that work with a shell. The contents are already in dissolved form, which makes absorption in the gut easier compared with dry powders. The shell also protects against oxygen and therefore against oxidation of the lipids it contains.
On the other hand, the principle of bolus release at a single point applies here too. Classic softgels usually consist of animal gelatine; plant-based variants are technically more demanding and less common. The fill volume is limited, so high-volume mineral or powder mixtures do not fit into softgels. Heat and pressure during production can also deform the shell or stress the lipids it contains.
What the ideal form would need to deliver
When you lay the five options side by side, you can formulate a few requirements that would matter for a modern multi-ingredient formulation:
- Controlled, ideally time-staggered release, so that transporters in the gut are not overwhelmed
- Protection of sensitive active ingredients against stomach acid, oxidation and moisture
- A lipid-compatible carrier, so that fat-soluble vitamins and omega-3 are present in the state in which they are absorbed
- Avoidance of unnecessary excipients such as binders, lubricants, flavourings and sweeteners
- Ease of intake without difficulty swallowing and without a strong inherent taste
None of the established forms meets all of these points at once. Tablets and capsules are stable, but rigid in their release. Powders and liquids are flexible, but sensitive or strong in taste. Softgels solve the lipid problem, but carry the bolus logic of the capsule over to a different class of substance.
With SphiroX technology, VYKEA takes the approach of combining several of these properties in a single form. Micronutrients are encapsulated in small spheres that are produced without compression pressure and without binders. The spheres are acid-resistant, allow a controlled release, work without flavourings and are delivered in pre-portioned sachets. The aim is to address several typical weaknesses of the individual dosage forms at the same time.
Conclusion
The question of the best dosage form is the question of the requirements. For a simple, well-tolerated substance, a capsule or tablet is enough. For fat-soluble active ingredients, a softgel or an oil suspension is the obvious choice. For complex multi-ingredient formulations, in which several substances need to be released in a staggered way and absorbed in the right place, it is worth looking beyond the classic forms.
VYKEA deliberately relies on a sachet form with SphiroX encapsulation, because it allows functionality, tolerability and ease of intake to be combined sensibly for complex micronutrient complexes.
