Filling without a machine
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Hand filling powder is slower and messier than it looks, and two of the difficulties are specific to this category.
What makes powders awkward
Low bulk density means a large airy volume for a small mass, so it flows unpredictably and takes time to settle in the tub. Fine powders carry static and cling to everything including the tub rim, which prevents a proper seal.
And the powder is segregating while you work: a hopper or jug empties non-uniformly, so the last tubs can differ in composition from the first.
Dust is the working hazard
Powder filling generates airborne particulate continuously, and a day of it is a day of breathing whatever you are making. Some supplement ingredients are potent at small doses and are not things to inhale.
A fitted particulate mask rather than a loose one, and ventilation or a downdraft arrangement if you can manage it. This is the one genuine occupational hazard in the property and it is easy to ignore because the material is food.
Dust is also a cross-contamination route between products and an explosion consideration at larger scale.
A bench that works
A scale under the tub, tared, filling to weight. A wide funnel sized to your coarsest blend. A soft brush for clearing the rim before the lid or induction seal goes on.
Keep the source container topped up rather than running it to empty, to limit segregation, and work in one product at a time with a proper clean-down between.
When to stop
When check-weights drift through a run, when the dust is unmanageable, or when open time per unit climbs because you are tired. An auger filler addresses speed, accuracy and open time together and is the first equipment purchase that pays here.